B. Calculate the mean median and mode of the given data.
Number of Mistakes Made by 50 Students in a Formative Test
Class Frequency
Class
(fx)
Cumulative Lower
Interval
Marks X
frequency
Limits (LL
18-20
19
38
50
17.5
15 - 17
5
16
80
48
14.5
12 - 14
78
43
9-11
10
10
100
37
6 - 8
15
7.
105
27
5.5
3-5
8
4
12
2.5
0-2
1
4
-0.5
= 3
13
8.5
32
Σ
Σ
=437
Number of Mistakes Made by 50 Students in a Formative Test
Class Frequency
Class
(fx)
Cumulative Lower
Interval
Marks X
frequency
Limits (LL
18-20
19
38
50
17.5
15 - 17
5
16
80
48
14.5
12 - 14
78
43
9-11
10
10
100
37
6 - 8
15
7.
105
27
5.5
3-5
8
4
12
2.5
0-2
1
4
-0.5
= 3
13
8.5
32
Σ
Σ
=437
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