Find the indicated zscore shown in the graph to the right. Area = 0.1 62 L\" The z-score is El. (Round to two decimal places as needed.) The undergraduate grade point averages (UGPA) of students taking an admissions test in a recent year can be approximated by a normal distribution, as shown in the gure. 9.53 (a) What is the minimum UGPA that would still place a student in the top 5% p 3'34 of UGPAs? o 0.1 E" (b) Between what two values does the middle 50% of the UGPAs lie? 2.68 3.34 4 Grade point average E) (a) The minimum UGPA that would still place a student in the top 5% of UGPAs is El. (Round to two decimal places as needed.) (b) The middle 50% of UGPAs lies between D on the low end and D on the high end. (Round to two decimal places as needed.) The graph of the waiting time (in seconds) at a red light is shown below on the left with its mean and standard deviation. Assume that a sample size of 225 is drawn from the population. Decide which of the graphs labeled (a)(c) would most closely resemble the sampling distribution of the sample means. Explain your reasoning. (a) (b) (C) P P ' P ' 51 0 04 (X) 6' 51 0.04 (22:12.9a 51 0 04 (22:12 9 El 51 0.55 0'22 = E .7 G' E =1 2 6' E = 17.7 Q E: l'lx = TS x E i F5 ' )7: E D: 2' 2' 4': 2' D: 0 50 D -40 40 D -20 50 D Time (in sec.) Time (in sec.) Time (in see Time (in sec.) Graph El most closely resembles the sampling distribution of the sample means, because p; = D, 6i = D, and the graph (Type an integer or a decimal.) Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $65,000. A random sample of 34 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $62,500? Assume a = $6,300. E) The probability that the mean salary of the sample is less than $62,500 is D. (Round to four decimal places as needed.) Interpret the results. Choose the correct answer below. {:1- A. About 1.03% of samples of 34 specialists will have a mean salary less than $62,500. This is not an unusual event. (":3 B. Only 1.03% of samples of 34 specialists will have a mean salary less than $62,500. This is an unusual event. C. About 10.3% of samples of 34 specialists will have a mean salary less than $62,500. This is not an unusual event. D. Only 10.3% of samples of 34 specialists will have a mean salary less than $62,500. This is an unusual event. Find the critical value 26 necessary to form a confidence interval at the level of condence shown below. c= 0.94 ZC=D (Round to two decimal places as needed.) Find the margin of error for the given values of c, o, and n. 0: 0.95, 6: 2.2, n =49 @ Click the icon to view a table of common critical values. E = D (Round to three decimal places as needed.)