Question

The length of an instant message conversation is normally distributed with a mean of 5 minutes and a standard deviation of 0.7 minutes.

What is the value 1 standard deviation to the right of the mean?

a) 5 minutes
b) 5.7 minutes
c) 4.3 minutes
d) 6.4 minutes

Answer 1

The value 1 standard deviation to the right of the mean for an instant message conversation length that's normally distributed with a mean of 5 minutes and a standard deviation of 0.7 minutes is 5.7 minutes.

Step-by-step explanation:

The length is normally distributed with a mean of 5 minutes and a standard deviation of 0.7 minutes. To find the value 1 standard deviation to the right of the mean, you add one standard deviation to the mean. Therefore, 1 standard deviation to the right of the mean would be 5 + 0.7 = 5.7 minutes. The correct answer is (b) 5.7 minutes.