The average time to run the 5K fun run is 24 minutes and the standard deviation is 2.6 minutes. 8 runners are randomly selected to run the 5K fun run. Round all answers to 4 decimal places where possible and assume a normal distribution. a. What is the distribution of X? X - N( 24 2.6 b. What is the distribution of æ? ¤ - N( 24 0.9192 v) đ c. What is the distribution of > x? ) x - N( 192 d. If one randomly selected runner is timed, find the probability that this runner's time will be between V, 7.3539 v) o 192 o 7.3539 23.7212 and 24.9212 minutes. e. For the 8 runners, find the probability that their average time is between 23.7212 and 24.9212 minutes. f. Find the probability that the randomly selected 8 person team will have a total time less than 186.4. g. For part e) and f), is the assumption of normal necessary? O NoO Yes h. The top 15% of all 8 person team relay races will compete in the championship round. These are the 15% lowest times. What is the longest total time that a relay team can have and still make it to the championship round? minutes

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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The average time to run the 5K fun run is 24 minutes and the standard deviation is 2.6 minutes. 8 runners
are randomly selected to run the 5K fun run. Round all answers to 4 decimal places where possible and
assume a normal distribution.
a. What is the distribution of X? X - N( 24
2.6
b. What is the distribution of ? ī - N( 24
0.9192
c. What is the distribution of > x? > x - N( 192
7.3539 v)
192
o 7.3539
d. If one randomly selected runner is timed, find the probability that this runner's time will be between
23.7212 and 24.9212 minutes.
e. For the 8 runners, find the probability that their average time is between 23.7212 and 24.9212
minutes.
f. Find the probability that the randomly selected 8 person team will have a total time less than 186.4.
g. For part e) and f), is the assumption of normal necessary? O NoO Yes
h. The top 15% of all 8 person team relay races will compete in the championship round. These are the
15% lowest times. What is the longest total time that a relay team can have and still make it to the
championship round?
minutes
Transcribed Image Text:The average time to run the 5K fun run is 24 minutes and the standard deviation is 2.6 minutes. 8 runners are randomly selected to run the 5K fun run. Round all answers to 4 decimal places where possible and assume a normal distribution. a. What is the distribution of X? X - N( 24 2.6 b. What is the distribution of ? ī - N( 24 0.9192 c. What is the distribution of > x? > x - N( 192 7.3539 v) 192 o 7.3539 d. If one randomly selected runner is timed, find the probability that this runner's time will be between 23.7212 and 24.9212 minutes. e. For the 8 runners, find the probability that their average time is between 23.7212 and 24.9212 minutes. f. Find the probability that the randomly selected 8 person team will have a total time less than 186.4. g. For part e) and f), is the assumption of normal necessary? O NoO Yes h. The top 15% of all 8 person team relay races will compete in the championship round. These are the 15% lowest times. What is the longest total time that a relay team can have and still make it to the championship round? minutes
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