The Central Limit Theorem for Sums · Try It 2
In a recent study, it was reported that the mean age of iPad users is 35 years. Suppose the standard deviation is ten years. The sample size is 39.
(a) What are the mean and standard deviation for the sum of the ages of iPad users? What is the distribution?
(b) Find the probability that the sum of the ages is between 1,400 and 1,500 years.
(c) Find the 90^th percentile for the sum of the 39 ages.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Introductory Statistics 2e · §7.2 The Central Limit Theorem for Sums · Try It 2
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