What is the percentage of values in the distribution between 7 and 13?

Question

A normal distribution has a mean of 7 and a standard deviation of 2. Use the 68-95-99.7 rule to find the percentage of values in the distribution between 7 and 13.

Answer 1

between 7 and 13 is 6 = 3 standard deviations when the standard deviation =2

by the empirical rule 99.7% fall within 3 standard deviations.

99.7/2 = 49.85 % fall between 7 and 13