HW3_skeleton

3.1

13. mean: 30.52 median: 31.3 mode: none, there is no mode.

14. mean: 93.1 median:87.9 mode:none, there is no mode

15.mean:3670 median: 3830 mode:4090

16. mean: 266 median:266 mode:260

17

1. mean>median. Because the shape of this histogram skewed right and in the skewed right histogram the mean is bigger than the median.

b)mean=median. This histogram is a symmetric histogram which almost likes the bell-shaped histogram. In symmertric histogram, the value of mean and median is the same.

c)mean<median. This histogram is a skewed left histogram that the value of median is bigger than the mean.

18

a)IV

b)III

c)II

d)I

3.2

5. sample Standard Deviation :6 Sample variance:36

6. sample Standard Deviation : 10 sample variance:100

7. population Standard Deviation : 4 Population variance: 16

8. population Standard Deviation : 8 population variance: 64

9.sample Standard Deviation :14 sample variance: 196

10. population Standard Deviation : 5 population variance: 25

14.Range: 25 Sample standard deviation:8.43