the average salary for graduates entering the actuarial field is $40,000. if the salaries are normally distributed with a standard deviation of $5000…

the average salary for graduates entering the actuarial field is $40,000. if the salaries are normally distributed with a standard deviation of $5000 find the probabilty that 

a. an individual graduate will have a salary  over $45,000

b. a group of nine graduates will have a group average over $45,000

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