The annual earnings (in dollars) of 40 randomly selected intermediate level life insurance underwriters. Use the data

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The annual earnings (in dollars) of 40 randomly selected intermediate level life insurance underwriters.

31,530 79,749 53,851 92,386 45,186 64,852 72,372 61,498 92,630 62,000 65,504 62,355 44,100 73,498 59,171 40,991 70,008 3


Use the data set to 

(a) Find the sample mean, 

(b) Find the sample standard deviation, and 

(c) Construct a 98% confidence interval for the population mean.

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