1 answer

Use the 68-95-99.7 rule to solve the problem

Question:

Use the 68-95-99.7 rule to solve the problem. - The amount of Jen's monthly phone bill is normally distributed with a mean of $53 and a standard deviation of $11. What percentage of her phone bills are between $20 and $86?

Answers

Z = (score-mean)/SD

Z = (20-53)/11 = -33/11 = -3

Calculate the other Z score and use the rule to calculate percentage between the two. Remember that the rules apply in both directions.

Or you could use a table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores..

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