Question
1. TKK Products manufactures 50-, 60-, 75-, and 100-watt electric light bulbs. Laboratory tests show that the lives of these light bulbs are normally distributed
1. TKK Products manufactures 50-, 60-, 75-, and 100-watt electric light bulbs. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and standard deviation of 100 hr. What is the probability that a TKK light bulb selected at random will burn for the following times? (Round your answers to four decimal places.)
-between 750 and 950 hr
- between 600 and 775 hr
2. The tread lives of the Super Titan radial tires under normal driving conditions are normally distributed with a mean of 40,000 mi and a standard deviation of 6000 mi. (Round your answers to four decimal places.)
-What is the probability that a tire selected at random will have a tread life of more than 33700 mi
-Determine the probability that four tires selected at random still have useful tread lives after 33700 mi of driving. (Assume that the tread lives of the tires are independent of each other.)
3. To be eligible for further consideration, applicants for certain civil service positions must first pass a written qualifying examination on which a score of 85 or more must be obtained. In a recent examination, it was found that the scores were normally distributed with a mean of 65 points and a standard deviation of 10 points. Determine the percentage of applicants who passed the written qualifying examination. (Round your answer to two decimal places.)
4. Use the appropriate normal distribution to approximate the resulting binomial distribution. A coin is weighted so that the probability of obtaining a head in a single toss is 0.6. If the coin is tossed 30 times, find the following probabilities. (Round your answers to four decimal places.)
-fewer than 18 heads
-between 18 and 20 heads, inclusive
-more than 24 heads
5. Use the appropriate normal distribution to approximate the resulting binomial distribution. A marksman's chance of hitting a target with each of his shots is 70%. (Assume the shots are independent of each other.) If he fires 40 shots, what is the probability of his hitting the target in each of the following situations? (Round your answers to four decimal places.)
-at least 31 times
-fewer than 19 times
-between 24 and 31 times, inclusive
6. Use the appropriate normal distribution to approximate the resulting binomial distribution. Jorge sells magazine subscriptions over the phone. He estimates that the probability of his making a sale with each attempt is 0.07. What is the probability of Jorge making more than 7 sales if he makes 80 calls? (Round your answer to four decimal places.)
48149_10_APP_p551-592 11/3/10 11:39 AM Page 587 APPENDIX D TABLES 587 48149_10_APP_p551-592 588 11/3/10 APPENDIX D 11:39 AM Page 588 TABLES TABLE 1 Binomial Probabilities p n x 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.95 2 0 1 2 0.902 0.095 0.002 0.810 0.180 0.010 0.640 0.320 0.040 0.490 0.420 0.090 0.360 0.480 0.160 0.250 0.500 0.250 0.160 0.480 0.360 0.090 0.420 0.490 0.040 0.320 0.640 0.010 0.180 0.810 0.002 0.095 0.902 3 0 1 2 3 0.857 0.135 0.007 0.729 0.243 0.027 0.001 0.512 0.384 0.096 0.008 0.343 0.441 0.189 0.027 0.216 0.432 0.288 0.064 0.125 0.375 0.375 0.125 0.064 0.288 0.432 0.216 0.027 0.189 0.441 0.343 0.008 0.096 0.384 0.512 0.001 0.027 0.243 0.729 0.007 0.135 0.857 0 1 2 3 4 0.815 0.171 0.014 0.656 0.292 0.049 0.004 0.410 0.410 0.154 0.026 0.002 0.240 0.412 0.265 0.076 0.008 0.130 0.346 0.346 0.154 0.026 0.062 0.250 0.375 0.250 0.062 0.026 0.154 0.346 0.346 0.130 0.008 0.076 0.265 0.412 0.240 0.002 0.026 0.154 0.410 0.410 0.004 0.049 0.292 0.656 0.014 0.171 0.815 0 1 2 3 4 5 0.774 0.204 0.021 0.001 0.590 0.328 0.073 0.008 0.328 0.410 0.205 0.051 0.006 0.168 0.360 0.309 0.132 0.028 0.002 0.078 0.259 0.346 0.230 0.077 0.010 0.031 0.156 0.312 0.312 0.156 0.031 0.010 0.077 0.230 0.346 0.259 0.078 0.002 0.028 0.132 0.309 0.360 0.168 0.006 0.051 0.205 0.410 0.328 0.008 0.073 0.328 0.590 0.001 0.021 0.204 0.774 0 1 2 3 4 5 6 0.735 0.232 0.031 0.002 0.531 0.354 0.098 0.015 0.001 0.262 0.393 0.246 0.082 0.015 0.002 0.118 0.303 0.324 0.185 0.060 0.010 0.001 0.047 0.187 0.311 0.276 0.138 0.037 0.004 0.016 0.094 0.234 0.312 0.234 0.094 0.016 0.004 0.037 0.138 0.276 0.311 0.187 0.047 0.001 0.010 0.060 0.185 0.324 0.303 0.118 0.002 0.015 0.082 0.246 0.393 0.262 0.001 0.015 0.098 0.354 0.531 0.002 0.031 0.232 0.735 0 1 2 3 4 5 6 7 0.698 0.257 0.041 0.004 0.478 0.372 0.124 0.023 0.003 0.210 0.367 0.275 0.115 0.029 0.004 0.082 0.247 0.318 0.227 0.097 0.025 0.004 0.028 0.131 0.261 0.290 0.194 0.077 0.017 0.002 0.008 0.055 0.164 0.273 0.273 0.164 0.055 0.008 0.002 0.017 0.077 0.194 0.290 0.261 0.131 0.028 0.004 0.025 0.097 0.227 0.318 0.247 0.082 0.004 0.029 0.115 0.275 0.367 0.210 0.003 0.023 0.124 0.372 0.478 0.004 0.041 0.257 0.698 0 1 2 3 4 5 6 7 8 0.663 0.279 0.051 0.005 0.430 0.383 0.149 0.033 0.005 0.168 0.336 0.294 0.147 0.046 0.009 0.001 0.058 0.198 0.296 0.254 0.136 0.047 0.010 0.001 0.017 0.090 0.209 0.279 0.232 0.124 0.041 0.008 0.001 0.004 0.031 0.109 0.219 0.273 0.219 0.109 0.031 0.004 0.001 0.008 0.041 0.124 0.232 0.279 0.209 0.090 0.017 0.001 0.010 0.047 0.136 0.254 0.296 0.198 0.058 0.001 0.009 0.046 0.147 0.294 0.336 0.168 0.005 0.033 0.149 0.383 0.430 0.005 0.051 0.279 0.663 4 5 6 7 8 48149_10_APP_p551-592 11/3/10 11:39 AM Page 589 APPENDIX D TABLES 589 TABLE 1 (continued) Binomial Probabilities p n x 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.95 9 0 1 2 3 4 5 6 7 8 9 0.630 0.299 0.063 0.008 0.001 0.387 0.387 0.172 0.045 0.007 0.001 0.134 0.302 0.302 0.176 0.066 0.017 0.003 0.040 0.156 0.267 0.267 0.172 0.074 0.021 0.004 0.010 0.060 0.161 0.251 0.251 0.167 0.074 0.021 0.004 0.002 0.018 0.070 0.164 0.246 0.246 0.164 0.070 0.018 0.002 0.004 0.021 0.074 0.167 0.251 0.251 0.161 0.060 0.010 0.004 0.021 0.074 0.172 0.267 0.267 0.156 0.040 0.003 0.017 0.066 0.176 0.302 0.302 0.134 0.001 0.007 0.045 0.172 0.387 0.387 0.001 0.008 0.063 0.299 0.630 0 1 2 3 4 5 6 7 8 9 10 0.599 0.315 0.075 0.010 0.001 0.349 0.387 0.194 0.057 0.011 0.001 0.107 0.268 0.302 0.201 0.088 0.026 0.006 0.001 0.028 0.121 0.233 0.267 0.200 0.103 0.037 0.009 0.001 0.006 0.040 0.121 0.215 0.251 0.201 0.111 0.042 0.011 0.002 0.001 0.010 0.044 0.117 0.205 0.246 0.205 0.117 0.044 0.010 0.001 0.002 0.011 0.042 0.111 0.201 0.251 0.215 0.121 0.040 0.006 0.001 0.009 0.037 0.103 0.200 0.267 0.233 0.121 0.028 0.001 0.006 0.026 0.088 0.201 0.302 0.268 0.107 0.001 0.011 0.057 0.194 0.387 0.349 0.001 0.010 0.075 0.315 0.599 0 1 2 3 4 5 6 7 8 9 10 11 0.569 0.329 0.087 0.014 0.001 0.086 0.236 0.295 0.221 0.111 0.039 0.010 0.002 0.020 0.093 0.200 0.257 0.220 0.132 0.057 0.017 0.004 0.001 0.004 0.027 0.089 0.177 0.236 0.221 0.147 0.070 0.023 0.005 0.001 0.001 0.005 0.023 0.070 0.147 0.221 0.236 0.177 0.089 0.027 0.004 0.001 0.004 0.017 0.057 0.132 0.220 0.257 0.200 0.093 0.020 0.002 0.010 0.039 0.111 0.221 0.295 0.236 0.086 0.002 0.016 0.071 0.213 0.384 0.314 0.001 0.014 0.087 0.329 0.569 0 1 2 3 4 5 6 7 8 9 10 11 12 0.540 0.341 0.099 0.017 0.002 0.069 0.206 0.283 0.236 0.133 0.053 0.016 0.003 0.001 0.014 0.071 0.168 0.240 0.231 0.158 0.079 0.029 0.008 0.001 0.002 0.017 0.064 0.142 0.213 0.227 0.177 0.101 0.042 0.012 0.002 0.002 0.012 0.042 0.101 0.177 0.227 0.213 0.142 0.064 0.017 0.002 0.001 0.008 0.029 0.079 0.158 0.231 0.240 0.168 0.071 0.014 0.001 0.003 0.016 0.053 0.133 0.236 0.283 0.206 0.069 0.004 0.021 0.085 0.230 0.377 0.282 0.002 0.017 0.099 0.341 0.540 10 11 12 0.314 0.384 0.213 0.071 0.016 0.002 0.282 0.377 0.230 0.085 0.021 0.004 0.005 0.027 0.081 0.161 0.226 0.226 0.161 0.081 0.027 0.005 0.003 0.016 0.054 0.121 0.193 0.226 0.193 0.121 0.054 0.016 0.003 48149_10_APP_p551-592 590 11/3/10 APPENDIX D 11:39 AM Page 590 TABLES TABLE 1 (continued) Binomial Probabilities p n x 0.05 0.1 0.2 0.3 0.4 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0.513 0.351 0.111 0.021 0.003 0.254 0.367 0.245 0.100 0.028 0.006 0.001 0.055 0.179 0.268 0.246 0.154 0.069 0.023 0.006 0.001 0.010 0.054 0.139 0.218 0.234 0.180 0.103 0.044 0.014 0.003 0.001 0.001 0.011 0.045 0.111 0.184 0.221 0.197 0.131 0.066 0.024 0.006 0.001 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0.488 0.359 0.123 0.026 0.004 0.007 0.041 0.113 0.194 0.229 0.196 0.126 0.062 0.023 0.007 0.001 0.001 0.007 0.032 0.085 0.155 0.207 0.207 0.157 0.092 0.041 0.014 0.003 0.001 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.463 0.366 0.135 0.031 0.005 0.001 14 15 0.229 0.356 0.257 0.114 0.035 0.008 0.001 0.206 0.343 0.267 0.129 0.043 0.010 0.002 0.044 0.154 0.250 0.250 0.172 0.086 0.032 0.009 0.002 0.035 0.132 0.231 0.250 0.188 0.103 0.043 0.014 0.003 0.001 0.005 0.031 0.092 0.170 0.219 0.206 0.147 0.081 0.035 0.012 0.003 0.001 0.005 0.022 0.063 0.127 0.186 0.207 0.177 0.118 0.061 0.024 0.007 0.002 0.5 0.002 0.010 0.035 0.087 0.157 0.209 0.209 0.157 0.087 0.035 0.010 0.002 0.001 0.006 0.022 0.061 0.122 0.183 0.209 0.183 0.122 0.061 0.022 0.006 0.001 0.003 0.014 0.042 0.092 0.153 0.196 0.196 0.153 0.092 0.042 0.014 0.003 0.6 0.7 0.8 0.9 0.95 0.001 0.006 0.024 0.066 0.131 0.197 0.221 0.184 0.111 0.045 0.011 0.001 0.001 0.003 0.014 0.044 0.103 0.180 0.234 0.218 0.139 0.054 0.010 0.001 0.006 0.023 0.069 0.154 0.246 0.268 0.179 0.055 0.001 0.006 0.028 0.100 0.245 0.367 0.254 0.003 0.021 0.111 0.351 0.513 0.001 0.003 0.014 0.041 0.092 0.157 0.207 0.207 0.155 0.085 0.032 0.007 0.001 0.001 0.007 0.023 0.062 0.126 0.196 0.229 0.194 0.113 0.041 0.007 0.002 0.009 0.032 0.086 0.172 0.250 0.250 0.154 0.044 0.001 0.008 0.035 0.114 0.257 0.356 0.229 0.004 0.026 0.123 0.359 0.488 0.001 0.003 0.012 0.035 0.081 0.147 0.206 0.219 0.170 0.092 0.031 0.005 0.001 0.003 0.014 0.043 0.103 0.188 0.250 0.231 0.132 0.035 0.002 0.010 0.043 0.129 0.267 0.343 0.206 0.001 0.005 0.031 0.135 0.366 0.463 0.002 0.007 0.024 0.061 0.118 0.177 0.207 0.186 0.127 0.063 0.022 0.005 48149_10_APP_p551-592 11/3/10 11:39 AM Page 591 APPENDIX D TABLES 591 TABLE 2 The Standard Normal Distribution Area 0 z Fz(z) P(Z z) z 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 \u00053.4 \u00053.3 \u00053.2 \u00053.1 \u00053.0 0.0003 0.0005 0.0007 0.0010 0.0013 0.0003 0.0005 0.0007 0.0009 0.0013 0.0003 0.0005 0.0006 0.0009 0.0013 0.0003 0.0004 0.0006 0.0009 0.0012 0.0003 0.0004 0.0006 0.0008 0.0012 0.0003 0.0004 0.0006 0.0008 0.0011 0.0003 0.0004 0.0006 0.0008 0.0011 0.0003 0.0004 0.0005 0.0008 0.0011 0.0003 0.0004 0.0005 0.0007 0.0010 0.0002 0.0003 0.0005 0.0007 0.0010 \u00052.9 \u00052.8 \u00052.7 \u00052.6 \u00052.5 0.0019 0.0026 0.0035 0.0047 0.0062 0.0018 0.0025 0.0034 0.0045 0.0060 0.0017 0.0024 0.0033 0.0044 0.0059 0.0017 0.0023 0.0032 0.0043 0.0057 0.0016 0.0023 0.0031 0.0041 0.0055 0.0016 0.0022 0.0030 0.0040 0.0054 0.0015 0.0021 0.0029 0.0039 0.0052 0.0015 0.0021 0.0028 0.0038 0.0051 0.0014 0.0020 0.0027 0.0037 0.0049 0.0014 0.0019 0.0026 0.0036 0.0048 \u00052.4 \u00052.3 \u00052.2 \u00052.1 \u00052.0 0.0082 0.0107 0.0139 0.0179 0.0228 0.0080 0.0104 0.0136 0.0174 0.0222 0.0078 0.0102 0.0132 0.0170 0.0217 0.0075 0.0099 0.0129 0.0166 0.0212 0.0073 0.0096 0.0125 0.0162 0.0207 0.0071 0.0094 0.0122 0.0158 0.0202 0.0069 0.0091 0.0119 0.0154 0.0197 0.0068 0.0089 0.0116 0.0150 0.0192 0.0066 0.0087 0.0113 0.0146 0.0188 0.0064 0.0084 0.0110 0.0143 0.0183 \u00051.9 \u00051.8 \u00051.7 \u00051.6 \u00051.5 0.0287 0.0359 0.0446 0.0548 0.0668 0.0281 0.0352 0.0436 0.0537 0.0655 0.0274 0.0344 0.0427 0.0526 0.0643 0.0268 0.0336 0.0418 0.0516 0.0630 0.0262 0.0329 0.0409 0.0505 0.0618 0.0256 0.0322 0.0401 0.0495 0.0606 0.0250 0.0314 0.0392 0.0485 0.0594 0.0244 0.0307 0.0384 0.0475 0.0582 0.0239 0.0301 0.0375 0.0465 0.0571 0.0233 0.0294 0.0367 0.0455 0.0559 \u00051.4 \u00051.3 \u00051.2 \u00051.1 \u00051.0 0.0808 0.0968 0.1151 0.1357 0.1587 0.0793 0.0951 0.1131 0.1335 0.1562 0.0778 0.0934 0.1112 0.1314 0.1539 0.0764 0.0918 0.1093 0.1292 0.1515 0.0749 0.0901 0.1075 0.1271 0.1492 0.0735 0.0885 0.1056 0.1251 0.1469 0.0722 0.0869 0.1038 0.1230 0.1446 0.0708 0.0853 0.1020 0.1210 0.1423 0.0694 0.0838 0.1003 0.1190 0.1401 0.0681 0.0823 0.0985 0.1170 0.1379 \u00050.9 \u00050.8 \u00050.7 \u00050.6 \u00050.5 0.1841 0.2119 0.2420 0.2743 0.3085 0.1814 0.2090 0.2389 0.2709 0.3050 0.1788 0.2061 0.2358 0.2676 0.3015 0.1762 0.2033 0.2327 0.2643 0.2981 0.1736 0.2005 0.2296 0.2611 0.2946 0.1711 0.1977 0.2266 0.2578 0.2912 0.1685 0.1949 0.2236 0.2546 0.2877 0.1660 0.1922 0.2206 0.2514 0.2843 0.1635 0.1894 0.2177 0.2483 0.2810 0.1611 0.1867 0.2148 0.2451 0.2776 \u00050.4 \u00050.3 \u00050.2 \u00050.1 \u00050.0 0.3446 0.3821 0.4207 0.4602 0.5000 0.3409 0.3783 0.4168 0.4562 0.4960 0.3372 0.3745 0.4129 0.4522 0.4920 0.3336 0.3707 0.4090 0.4483 0.4880 0.3300 0.3669 0.4052 0.4443 0.4840 0.3264 0.3632 0.4013 0.4404 0.4801 0.3228 0.3594 0.3974 0.4364 0.4761 0.3192 0.3557 0.3936 0.4325 0.4721 0.3156 0.3520 0.3897 0.4286 0.4681 0.3121 0.3483 0.3859 0.4247 0.4641 48149_10_APP_p551-592 592 11/3/10 APPENDIX D 11:39 AM Page 592 TABLES TABLE 2 (continued) The Standard Normal Distribution Fz(z) P(Z z) z 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.5000 0.5398 0.5793 0.6179 0.6554 0.6915 0.7257 0.7580 0.7881 0.8159 0.5040 0.5438 0.5832 0.6217 0.6591 0.6950 0.7291 0.7611 0.7910 0.8186 0.5080 0.5478 0.5871 0.6255 0.6628 0.6985 0.7324 0.7642 0.7939 0.8212 0.5120 0.5517 0.5910 0.6293 0.6664 0.7019 0.7357 0.7673 0.7967 0.8238 0.5160 0.5557 0.5948 0.6331 0.6700 0.7054 0.7389 0.7704 0.7995 0.8264 0.5199 0.5596 0.5987 0.6368 0.6736 0.7088 0.7422 0.7734 0.8023 0.8289 0.5239 0.5636 0.6026 0.6406 0.6772 0.7123 0.7454 0.7764 0.8051 0.8315 0.5279 0.5675 0.6064 0.6443 0.6808 0.7157 0.7486 0.7794 0.8078 0.8340 0.5319 0.5714 0.6103 0.6480 0.6844 0.7190 0.7517 0.7823 0.8106 0.8365 0.5359 0.5753 0.6141 0.6517 0.6879 0.7224 0.7549 0.7852 0.8133 0.8389 1.0 1.1 1.2 1.3 1.4 0.8413 0.8643 0.8849 0.9032 0.9192 0.8438 0.8665 0.8869 0.9049 0.9207 0.8461 0.8686 0.8888 0.9066 0.9222 0.8485 0.8708 0.8907 0.9082 0.9236 0.8508 0.8729 0.8925 0.9099 0.9251 0.8531 0.8749 0.8944 0.9115 0.9265 0.8554 0.8770 0.8962 0.9131 0.9278 0.8577 0.8790 0.8980 0.9147 0.9292 0.8599 0.8810 0.8997 0.9162 0.9306 0.8621 0.8830 0.9015 0.9177 0.9319 1.5 1.6 1.7 1.8 1.9 0.9332 0.9452 0.9554 0.9641 0.9713 0.9345 0.9463 0.9564 0.9649 0.9719 0.9357 0.9474 0.9573 0.9656 0.9726 0.9370 0.9484 0.9582 0.9664 0.9732 0.9382 0.9495 0.9591 0.9671 0.9738 0.9394 0.9505 0.9599 0.9678 0.9744 0.9406 0.9515 0.9608 0.9686 0.9750 0.9418 0.9525 0.9616 0.9693 0.9756 0.9429 0.9535 0.9625 0.9699 0.9761 0.9441 0.9545 0.9633 0.9706 0.9767 2.0 2.1 2.2 2.3 2.4 0.9772 0.9821 0.9861 0.9893 0.9918 0.9778 0.9826 0.9864 0.9896 0.9920 0.9783 0.9830 0.9868 0.9898 0.9922 0.9788 0.9834 0.9871 0.9901 0.9925 0.9793 0.9838 0.9875 0.9904 0.9927 0.9798 0.9842 0.9878 0.9906 0.9929 0.9803 0.9846 0.9881 0.9909 0.9931 0.9808 0.9850 0.9884 0.9911 0.9932 0.9812 0.9854 0.9887 0.9913 0.9934 0.9817 0.9857 0.9890 0.9916 0.9936 2.5 2.6 2.7 2.8 2.9 0.9938 0.9953 0.9965 0.9974 0.9981 0.9940 0.9955 0.9966 0.9975 0.9982 0.9951 0.9956 0.9967 0.9976 0.9982 0.9943 0.9957 0.9968 0.9977 0.9983 0.9945 0.9959 0.9969 0.9977 0.9984 0.9946 0.9960 0.9970 0.9978 0.9984 0.9948 0.9961 0.9971 0.9979 0.9985 0.9949 0.9962 0.9972 0.9979 0.9985 0.9951 0.9963 0.9973 0.9980 0.9986 0.9952 0.9964 0.9974 0.9981 0.9986 3.0 3.1 3.2 3.3 3.4 0.9987 0.9990 0.9993 0.9995 0.9997 0.9987 0.9991 0.9993 0.9995 0.9997 0.9987 0.9991 0.9994 0.9995 0.9997 0.9988 0.9991 0.9994 0.9996 0.9997 0.9988 0.9992 0.9994 0.9996 0.9997 0.9989 0.9992 0.9994 0.9996 0.9997 0.9989 0.9992 0.9994 0.9996 0.9997 0.9989 0.9992 0.9995 0.9996 0.9997 0.9990 0.9993 0.9995 0.9996 0.9997 0.9990 0.9993 0.9995 0.9997 0.9998Step by Step Solution
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