EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 20 students are given below. Find the mean.
Height (in cm)
129
131
132
139
143
158
165
175
No. of students
2
6
1
3
2
1
3
2
(i)
721
5
cm
(ii)
1461
10
cm
(iii)
1451
10
cm
(iv)
1441
10
cm
(v)
1443
10
cm
Question
2
2.
Heights of 25 plants are given below. Find the mean.
Height (in cm)
51
52
56
57
88
96
97
No. of plants
2
2
2
5
3
4
7
(i)
396
5
cm
(ii)
386
5
cm
(iii)
391
5
cm
(iv)
387
5
cm
(v)
388
5
cm
Question
3
3.
Ages of 15 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
3
1
2
3
2
4
(i)
69
5
years
(ii)
74
5
years
(iii)
66
5
years
(iv)
64
5
years
(v)
13
years
Question
4
4.
Scores of 20 students are given below. Find the mean.
Score
70
71
73
74
75
78
83
84
86
87
No. of students
1
1
4
2
2
4
1
1
2
2
(i)
399
5
(ii)
391
5
(iii)
78
(iv)
394
5
(v)
389
5
Question
5
5.
Rainfall of 25 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
8
9
10
11
12
13
14
15
No. of days
4
3
2
1
1
3
1
2
4
3
1
(i)
243
25
mm
(ii)
293
25
mm
(iii)
268
25
mm
(iv)
49
5
mm
(v)
244
25
mm
Question
6
6.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
29
30
31
32
34
35
No. of days
4
2
5
1
2
3
3
4
1
(i)
786
25
°C
(ii)
737
25
°C
(iii)
761
25
°C
(iv)
736
25
°C
(v)
738
25
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
41
42
43
58
59
No. of students
2
1
3
2
2
(i)
497
10
kg
(ii)
507
10
kg
(iii)
489
10
kg
(iv)
244
5
kg
(v)
487
10
kg
Question
8
8.
Wages of 30 labourers are given below. Find the mean.
Wage (in rupees)
337
365
390
391
416
427
474
480
486
No. of labourers
2
3
3
5
3
2
7
4
1
(i)
₹
425.00
(ii)
₹
426.00
(iii)
₹
423.00
(iv)
₹
424.00
(v)
₹
422.00
Assignment Key
1) (iv)
2) (ii)
3) (iv)
4) (v)
5) (i)
6) (iv)
7) (v)
8) (iv)
