A New Phone System Was Installed Last Year to Help

Multiple Choice

A new phone system was installed last year to help reduce the expense of personal calls that were being madeby employees. Before the new system was installed, the amount being spent on personal calls followed anormal distribution with an average of $500 per month and a standard deviation of $50 per month. Refer tosuch expenses as PCEʹs (personal call expenses) . Using the distribution above, what is the probability that arandomly selected month had a PCE of between $375.00 and $590.00?

A) 0.9579
B) 0.0421
C) 0.9999
D) 0.0001