Question: A study by the National Gulf Foundation report that the 6.2 million golfers over the age of 50 spent an average of $939 on golf during the previous year. Assuming a normal distribution with a standard deviation of $200, what is the probability that a randomly selected golfer in this age group will have spend:

a) more than $1539?

b) between $939 and $1339?

c) less than $1139?

d) between $539 and $1139?