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Author Question: For a normal curve, if the mean is 20 minutes and the standard deviation is 5 minutes, find the area ... (Read 49 times)

Marty

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on: Jun 24, 2018
For a normal curve, if the mean is 20 minutes and the standard deviation is 5 minutes, find the area to the right of 12 minutes.

Question 2

The publisher of a daily newspaper claims that 90 of its subscribers are under the age of 30 . Suppose that a sample of 300 subscribers is selected at random. Assuming the claim is correct, approximate the probability of finding at least 240 subscribers in the sample under the age of 30.


31809pancho

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Reply #1 on: Jun 24, 2018
Answer to Question 1

0.9452

Answer to Question 2

1


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