Question
Find the numberof observation lying between $\overline{\text{X}}-\text{M.D. }$ and $\overline{\text{X}} +\text{ M.D.}$ is the mean deviation from the mean.
$38, 70, 48, 34, 63, 42, 55, 44, 53, 47$
$38, 70, 48, 34, 63, 42, 55, 44, 53, 47$
|
$x_i$
|
$|d_i| = |x_i - 49.4|$
|
|
38
|
11.4
|
|
70
|
20.6
|
|
48
|
1.4
|
|
34
|
15.4
|
|
63
|
13.6
|
|
42
|
7.4
|
|
55
|
5.6
|
|
44
|
5.4
|
|
53
|
3.6
|
|
47
|
2.4
|
|
Total
|
86.8
|
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
|
Class interval
|
$0-4$ | $4-8$ | $8-12$ | $12-16$ | $16-20$ |
|
Frequency
|
$4$ | $6$ | $8$ | $5$ | $2$ |
|
Age (on nearest birth day)
|
17-19.5
|
20-25.5
|
26-35.5
|
36-40.5
|
41-50.5
|
51-55.5
|
56-60.5
|
61-70.5
|
|
No. of persons
|
5
|
16
|
12
|
26
|
14
|
12
|
6
|
5
|