As shown in Example 6.12, incomes of junior executives are normally distributed with a standard deviation of

Question:

As shown in Example 6.12, incomes of junior executives are normally distributed with a standard deviation of $3828.
a. What is the mean for the salaries of junior executives, if a salary of $62,900 is at the top end of the middle 80% of incomes?
b. With the additional information learned in part a, what is the probability that ahand/mWw lligt5ydljustjarga.com executive earns less than $50,000?