The following data set represents the repair costs for a random sample of 30 refrigerators.

51.82 62.81 67.80 78.16 83.48 88.88 98.13 98.79 100.07 100.35 101.68 101.72 103.01

105.21 105.34 106.50 110.05 111.32 113.59 114.19 115.62 121.32 127.14 128.42 128.17

129.11 130.70 150.52 151.84 157.06

(a) Find the point estimate of the population mean. _____________

(b) Calculate the margin of error for a 95% level of confidence. _____________

(c) Construct a 95% confidence interval for the population mean. _____________