calculus
posted by peter .
The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation
2.045 minutes.
1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres for a sample of 30 users will be more than 8 minutes.
Options for Question 1
A 0.0160 B 0.2000 C 0.2486 D 0.8003 E 0.8030 F 0.8106
2 Choose the option that gives an approximate range of values,in minutes, symmetric about the mean, within which the meantime taken to run 1000 metres for approximately 95% of samples of 30 users will lie.
Options for Question 2
A (6.584, 7.816) B (6.469, 7.931) C (3.192, 11.208) D (6.640, 7.760) E (7.066, 7.334) F (4.088, 11.312)
Respond to this Question
Similar Questions

maths
The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken … 
maths
The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken … 
DBU
The mean time to complete a psychology exam is 34 minutes with a standard deviation of 8 minutes. Assume the distribution is normal. Find the probability of a student taking less than 28 minutes. 
probability
suppose that the times taken to complete an online test are normally distributed with a mean of 45 minutes and a standard deviation of 12 minutes. find the probability a. that for a randomly selected test, the time taken was more than … 
statistic
Over the past 10 years, the local school district has measured physical fitness for all high school freshmen. During that time, the average score on a treadmill endurance task has been μ 19.8 minutes with a standard deviation … 
statistics
According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79 minutes. … 
statistics
According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79 minutes. … 
statisticss
The time taken by a man to deliver milk is normally distributed with, mean 12 minutes and standard deviation 2 minutes. He delivers milk everyday estimate the probability that he takes. (a) longer than 17 minutes (b) between 9 and … 
statistics
Let x denote the time taken to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at random, what is the probability that this … 
algebra 1
The mean number of minutes spent on a treadmill at the local gym is 28 minutes with a standard deviation of 8. If Kurt's zscore is 1.75, how much time did he spend on the treadmill?