3.1

13 mean: 30.5166, median: 31.3, mode: none

14 mean: 93.1, median: 87.9, mode: none

15 mean: 3670, median: 3830, mode: 4090

16 mean: 266, median: 266, mode: 260

17

  1. mean is greater than median because the data is skewed right distribution

  2. mean is equal to median because the data is symmetric distribution

  3. mean is lesser than median because the data is skewed left distribution

18

  1. IV

  2. III

  3. II

  4. I

3.2

5 Sample variance = 36, sample standard deviation = 6

6 Sample variance = 100, sample standard deviation = 10

7 Population variance = 16, Population standard deviation = 4

8 Population variance = 64, Population standard deviation = 8.

9 Sample variance = 196, sample standard deviation = 14

10 Population variance = 25, Population standard deviation = 5

14 R = 25, s = 8.