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The first-year salaries of university graduates are normally distributed with the population mean = $60000 and the population standard deviation = $15000. a)Find the probability

The first-year salaries of university graduates are normally distributed with the population mean = $60000 and the population standard deviation = $15000.

a)Find the probability of a randomly selected graduate earning less than $42000 annually.

b)Find the minimum salary of the top 15% earners

c)Find the probability that the mean annual salary by a random sample of 4 graduates is more than $50000.

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