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 $50 and a standard deviation of $10. What percentage of her phone bills are between $40 and $60?

Question

Quizplus · Accepted Answer

According to the 68-95-99.7 rule, 68% of data in a normal distribution falls within one standard deviation of the mean. Here, $40 to $60 is within one standard deviation ($10) from the mean ($50).

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