Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is µ = 45.7 years with a standard deviation of σ = 12.5 years. Assuming that the distribution of...

Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is

µ = 45.7 years with a standard deviation of σ = 12.5 years. Assuming that the distribution of drivers’ ages is approximately normal, answer the following questions:

a. What proportion of licensed drivers are older than 50 years old?

b. What proportion of licensed drivers are younger than 30 years old?