\\f In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 61 and a standard deviation of 10. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 41 and 81? Please round to one decimal place and do not enter the percent symbol. Question Help: D Post to forum Submit Question The physical plant at the main campus of a large state university recieves daily requests to replace fluorescent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 57 and a standard deviation of 3. Using the empirical rule, what is the approximate percentage of lightbulb replacement requests numbering between 57 and 63? Please round to one decimal place and do not enter the percent symbol. Question Help: D Post to forum Submit Question The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 44 and a standard deviation of 3. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 38 and 47? Please round to one decimal place and do not enter the percent symbol. Question Help: D Post to forum Submit Question The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.3 days and standard deviation of 1.8 days. Use Onlinestatbook or GeoGebra to find the following probabilities. Write your answers in percent form. Round your percentages to two decimal places. a) What is the probability of spending less than 9 days in recovery? [:96 b) What is the probability of spending more than 5 days in recovery? [:'36 c) What is the probability of spending between 5 days and 9 days in recovery? S96 Question Help: D Post to forum Submit Question Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 245 feet and a standard deviation of 48 feet. Use Onlinestatbook or GeoGebra to answer the following questions. Write your answers in percent form. Round your percentages to two decimal places. a) If one fly ball is randomly chosen from this distribution, what is the probability that this ball traveled fewer than 204 feet? P(fewer than 204 feet) = [:96 b) If one fly ball is randomly chosen from this distribution, what is the probability that this ball traveled more than 228 feet? P(more than 223 feet) = Ck Question Help: D Post to forum Submit Question A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.7 years, and standard deviation of 1.6 years. If you randomly purchase one item, what is the probability it will last longer than 13 years? Question Help: D Post to forum Submit Question The amount of time to complete a physical activity in a PE class is approximately normally distributed with a mean of 36.1 seconds and a standard deviation of 7.4 seconds. a) What is the probability that a randomly chosen student completes the activity in less than 32 seconds? D b) What is the probability that a randomly chosen student completes the activity in more than 45.2 seconds? [I c) What proportion of students take between 31.5 and 40.5 seconds to complete the activity? [3 d) 80% of all students finish the activity in less than C] seconds. Question Help: D Post to forum Submit Question The mass of a species of mouse commonly found in houses is normally distributed with a mean of 19.2 grams with a standard deviation of 0.17 grams. For parts (a) through (c), enter your responses as a decimal with 4 decimal places. a) What is the probability that a randomly chosen mouse has a mass of less than 19.11 grams? [3 b) What is the probability that a randomly chosen mouse has a mass of more than 19.41 grams? C] c) What proportion of mice have a mass between 19.09 and 19.27 grams? [3 d) 20% of all mice have a mass of less than C] grams. Question Help: D Post to forum Submit Question Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of 0C and a standard deviation of 1.00C. A single thermometer is randomly selected and tested. Find the probability of obtaining a reading less than -0.032"C. 002
