The average hourly wage of plumbers is normally distributed with a population mean of $32.00 and a p

The average hourly wage of plumbers is normally distributed with a population mean of $32.00 and a population standard deviation of $6.00. Calculate the following:

(a) The proportion of plumbers earning between $20 and $24.

(b) The proportion of plumbers earning more than $38.

(c) The proportion of plumbers earning less than $15.

(d) Calculated the 80th percentile.

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