Eastern States Bank and Trust monitors its drive-thru service times electronically to ensure that its speed of service is meeting the company’s goals. A sample of 28 drive-thru times was recently taken and is shown here.

Speed of Service (time in seconds)
83 138 145 147 130 79 156 156 90 85 68 93 178 76 73 119 92 146 88 103 116 134 162 71 181 110 105 74

a. Compute the mean, median, and mode for these sample data.

b. Indicate whether the data are symmetrical or skewed.

c. Construct a box and whisker plot for the sample data. Does the box and whisker plot support your conclusions in part b concerning the symmetry or skewness of these data?