A health insurance broker records the monthly extended health and dental insurance premiums for 18 non-smoking white-collar clients between the ages of 31 and 40 (measured in $):

57	83	90	49	133	113	83	58	62
56	67	104	87	151	76	149	134	147

T-Distribution Table

a. Calculate the sample mean and standard deviation.

x=x=

Round to the nearest cent

s=s=

Round to the nearest cent

b. Construct a 95% confidence interval for the mean monthly insurance premium for all non-smoking white-collar clients between the ages of 31 and 40.

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Round to the nearest cent