EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 15 students are given below. Find the mean.
Height (in cm)
130
142
143
149
156
162
164
No. of students
1
4
1
2
2
3
2
(i)
153
cm
(ii)
151
cm
(iii)
152
cm
(iv)
149
cm
(v)
150
cm
Question
2
2.
Heights of 30 plants are given below. Find the mean.
Height (in cm)
59
74
80
88
91
97
100
No. of plants
5
4
7
2
1
3
8
(i)
2539
30
cm
(ii)
837
10
cm
(iii)
2569
30
cm
(iv)
2509
30
cm
(v)
251
3
cm
Question
3
3.
Ages of 25 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
6
1
2
7
4
5
(i)
319
25
years
(ii)
367
25
years
(iii)
317
25
years
(iv)
342
25
years
(v)
318
25
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
71
72
75
79
84
87
89
No. of students
1
1
3
1
2
1
1
(i)
791
10
(ii)
801
10
(iii)
793
10
(iv)
396
5
(v)
811
10
Question
5
5.
Rainfall of 20 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
8
9
10
11
12
14
15
No. of days
1
3
2
1
1
2
3
2
2
3
(i)
56
5
mm
(ii)
53
5
mm
(iii)
61
5
mm
(iv)
51
5
mm
(v)
52
5
mm
Question
6
6.
Temperatures of 15 days are given below. Find the mean.
Temperature (in degree C)
25
28
29
30
31
32
34
35
No. of days
1
1
1
4
2
2
3
1
(i)
32
°C
(ii)
31
°C
(iii)
30
°C
(iv)
29
°C
(v)
33
°C
Question
7
7.
Weights of 15 students are given below. Find the mean.
Weight (in kg)
40
46
48
59
60
No. of students
2
3
4
2
4
(i)
257
5
kg
(ii)
256
5
kg
(iii)
261
5
kg
(iv)
258
5
kg
(v)
266
5
kg
Question
8
8.
Wages of 20 labourers are given below. Find the mean.
Wage (in rupees)
310
311
339
346
380
408
439
465
496
No. of labourers
1
3
2
2
1
3
2
1
5
(i)
₹
400.00
(ii)
₹
402.00
(iii)
₹
401.00
(iv)
₹
404.00
(v)
₹
403.00
Assignment Key
1) (ii)
2) (iv)
3) (iii)
4) (i)
5) (iv)
6) (ii)
7) (ii)
8) (ii)
