Statistics

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The following data set represents the repair costs (in dollars) for a random sample of 30 dishwashers.

41.82 52.81 57.80 68.16 73.48 78.88 88.13 88.79
90.07 90.35 91.68 91.72 93.01 95.21 95.34 96.50
100.05 101.32 103.59 104.19 105.62 111.32 117.14 118.42
118.77 119.01 120.70 140.52 141.84 147.06

(a) Find the point estimate of the population mean.
(b) Find the margin of error for a 95% level of confidence.
(c) Construct a 95% confidence interval for the population mean and interpret the results.

The point of estimate is 97.11. Is that correct?

I don't know where to start with b

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