solution:
the given information as follows:
mean = = 22
SD = = 1.31
sample size = n = 68
we have to find the probability that sample mean is less than 22.1 =
so corresponding z score as follows:
= value of z to the left of 0.63 from the standard normal table = 0.7357
so, probability that sample mean is less than 22.1 = 0.7357
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