Apply the 68-95-99.7 rule to answer the question.
-The amount of Jen's monthly phone bill is normally distributed with a mean of $78 and a standard deviation of $10. What percentage of her phone bills are between $48 and $108?

Question

Quizplus · Accepted Answer

The 68-95-99.7 rule, also known as the empirical rule, states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% falls within two standard deviations, and 99.7% falls within three standard deviations. In this case, $48 and $108 are three standard deviations below and above the mean ($78 ± 3*$10), respectively. Therefore, 99.7% of Jen's phone bills are between $48 and $108.

Apply the 68-95-99.7 Rule to Answer the Question