On Friday night, the owner of Chez Pierre in downtown Chicago noted the amount spent for dinner Based at 28 four-person tables.

(a) Use Excel or MegaStat to find the mean, midrange, geometric mean, and 10 percent trimmed mean (i. e., dropping the first three and last three observations).

(b) Do these measures of central tendency agree? Explain.

95 103 109 170 114 113 107
124 105 80 104 84 176 115
69 95 134 108 61 160 128
68 95 61 150 52 87 136