13 Use the empirical rule to solve the problem The amount of

13. Use the empirical rule to solve the problem.

The amount of Jen\'s monthly phone bill is normally distributed with a mean of $74 and a standard deviation of $8.

Fill in the blanks. 68.26% of her phone bills are between $___ and $___.

58, 74

66, 82

58, 90

74, 82

Solution

68.26% of the data in a normal distribution lies within one standard deviation of mean.

So, the required interval is - (74-8, 74+8) = (66,82)

Hence, option B is correct.