Find the percent of the total area under a normal curve that is contained within the specified interval.?

Question

Find the percent of the total area under a normal curve that is contained within the specified interval. Between the mean and 2.41 standard deviations from the mean.

I am having trouble doing the configuration for this. I do not understand how to do the computing on the calculator.

Any help would be appreciated.

Answer 1

Somewhere there is a friendly Z-table. If you enter 2.41 as the standard deviation, it will give you the total area (you may have to interpolate) from -(infinity) to that point. Subtract 0.5 from that value, which the the area between -(infinity) and the mean.