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lilloser
30.06.2019 •
Mathematics
Suppose the number of students in a class for the business statistics program at a university has a mean of 23 with a standard deviation of 4.3. if 15 classes are selected randomly, find the probability that the mean number of students is between 20 & 30.a: 0.9966b: 0.6824c: 0.8412d: 0.9699
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Ответ:
irst, find the z score of a score of 80. this is given by the formula z = (x-u)/o, where x is the score, u is the mean, and o is the standard deviation. this gives
z = (80-78)/12 = 1/6 = .1667
now, find what percentile a z score of 1/6 correlates to in the normal distribution.
a z score of 1/6 = .1667 is equivalent to the 56.36th percentile of the distribution. so the probability a score is over this is 1-.5636 = .4364
the mean of a sample mean is equal to the original mean. however, the standard deviation of a sample mean is equal to the original standard deviation divided by the square root of n (sample size). so the new standard deviation is 12/sqrt(16) = 3.
the new z score is 80-78/3 = 2/3 = .667. this is equivalent to the 74.86th percentile. so the probability that the mean will be greater than this score is 1-.7486 = .2514.
Ответ: