The accompanying data represent the total travel tax(in dollars) for a3-day business trip in 8 randomly selected cities. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts(a) and (b) below.

Data : 67.58 78.03 70.47 83.88 79.47 86.52 100.76 98.07

a) Determine a point estimate for the population mean travel tax?

b) Construct and interpret a 95% confidence interval for the mean tax paid for athree-day business trip.