Question: The annual commissions earned by sales representatives of Machine Products, Inc., a manufacturer of light machinery, follow the normal probability distribution. The mean yearly amount earned is $40,000 and the standard deviation is $5,000.

a) What percent of the sales representatives earn more than $42,000 per year?

b) What percent of the sales representatives earn between $32,000 and $42,000?

c) What percent of the sales representatives earn between $32,000 and $35,000?

d) The sales manager wants to award the sales representatives who earn the largest commissions a bonus of $1,000. He can award a bonus to 20 percent of the representatives. What is the cutoff point between those who earn a bonus and those who do not?