Using the Central Limit Theorem · Example 5
(a) Find the probability that the mean excess time used by the 80 customers in the sample is longer than 20 minutes. This is asking us to find P( > 20). Draw the graph.
(b) Suppose that one customer who exceeds the time limit for his cell phone contract is randomly selected. Find the probability that this individual customer's excess time is longer than 20 minutes. This is asking us to find P(x > 20).
(c) Explain why the probabilities in parts a and b are different.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Introductory Statistics 2e · §7.3 Using the Central Limit Theorem · Example 5
No hints for this one.
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