EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 25 students are given below. Find the mean.
Height (in cm)
142
148
150
153
157
162
169
No. of students
4
2
2
5
2
3
7
(i)
3912
25
cm
(ii)
3937
25
cm
(iii)
3914
25
cm
(iv)
3913
25
cm
(v)
3962
25
cm
Question
2
2.
Heights of 15 plants are given below. Find the mean.
Height (in cm)
51
52
59
62
64
71
81
88
92
No. of plants
2
4
1
1
2
1
1
2
1
(i)
1009
15
cm
(ii)
327
5
cm
(iii)
196
3
cm
(iv)
994
15
cm
(v)
979
15
cm
Question
3
3.
Ages of 30 students are given below. Find the mean.
Age (in years)
10
12
13
14
15
No. of students
7
8
5
5
5
(i)
38
3
years
(ii)
203
15
years
(iii)
63
5
years
(iv)
218
15
years
(v)
188
15
years
Question
4
4.
Scores of 20 students are given below. Find the mean.
Score
74
76
80
84
87
89
90
No. of students
2
2
4
5
1
2
4
(i)
335
4
(ii)
341
4
(iii)
333
4
(iv)
337
4
(v)
167
2
Question
5
5.
Rainfall of 30 days are given below. Find the mean.
Rainfall (in mm)
6
7
8
10
11
12
13
14
15
No. of days
2
2
3
5
4
5
4
2
3
(i)
389
30
mm
(ii)
329
30
mm
(iii)
11
mm
(iv)
359
30
mm
(v)
331
30
mm
Question
6
6.
Temperatures of 15 days are given below. Find the mean.
Temperature (in degree C)
25
27
28
29
30
34
No. of days
1
3
2
3
3
3
(i)
147
5
°C
(ii)
157
5
°C
(iii)
149
5
°C
(iv)
148
5
°C
(v)
152
5
°C
Question
7
7.
Weights of 30 students are given below. Find the mean.
Weight (in kg)
40
43
46
48
49
52
54
55
56
58
59
No. of students
4
2
1
2
5
1
3
2
4
4
2
(i)
1561
30
kg
(ii)
511
10
kg
(iii)
1591
30
kg
(iv)
766
15
kg
(v)
1531
30
kg
Question
8
8.
Wages of 15 labourers are given below. Find the mean.
Wage (in rupees)
337
345
407
421
498
No. of labourers
3
2
4
3
3
(i)
₹
405.73
(ii)
₹
405.80
(iii)
₹
405.87
(iv)
₹
407.73
(v)
₹
406.73
Assignment Key
1) (i)
2) (v)
3) (v)
4) (iii)
5) (ii)
6) (i)
7) (v)
8) (i)
