Work Sheet #3 STA 2023

For #1 and #2 find by hand: a) mean, b) median, c) mode, d) range, e) midrange, f) standard deviation, g) variance

Round answers to 1 place beyond the data given.

1)The number of car crashes per month in a certain county:

27 8 17 11 15 25 16 14 14 14 13 18

2) The given values are the service times (in seconds) of a McDonald’s drive-through customers:

88 107 35 93 65 55 119 83 99 74 46 108

For #3 and #4, use your calculator to find for each set of data: a) mean, b) mode, c) range, d) standard deviation, e) variance, f) 5-number summary, g) interquartile range

(round values to 1 place beyond the data given)

Then compare the two sets.

3) Waiting times of customers at a certain bank where customers enter a single line:

6.5 6.6 6.7 6.8 7.1 7.3 7.4 7.7 7.7 7.7

Waiting times of customers at another bank where customers wait in individual lines at three tellers:

4.2 5.4 5.8 6.2 6.7 7.7 7.7 8.5 9.3 10.0

4) Male skull breadths for samples of Egyptian skulls from 4000 BC:

131 119 138 125 129 126 131 132 126 128 128 131

Male skull breadths for samples of Egyptian skulls from 150 AD:

136 130 126 126 139 141 137 138 133 131 134 129