3.1

13 Mean = 30.52 mpg Median = 31.3 mpg No mode

14 Mean = 93.1 Median = 87.9 No mode

15 Strenghts of concrete in psi=

Mean= 3670 Median= 3830 Mode= 4090

16 Mean = 266 Median = 266 Mode = 260

17

  1. mean > median Right/positive skew

  2. mean = median Bell curve/no skew

  3. mean < median Left/negative skew

18

  1. 4

  2. 3

  3. 2

  4. 1

3.2

5 \(s^{2}\) = 36 s = 6

6 \(s^{2}\) = 100 s = 10

7 Population variance = 16 st dev = 4

8 Population variance = 64 st dev = 8

9 \(s^{2}\) = 196 s = 14

10 Population variance = 25 st dev = 5

14 Range= 25 st dev = 8.43