EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 11 students in a test are given below. Find the mean score.
11
4
5
15
9
16
17
10
13
12
16
(i)
13
(ii)
11
7
11
(iii)
12
(iv)
4
(v)
17
Question
2
2.
The marks obtained by 15 students in a test are given below. Find their mean marks.
15
17
9
31
27
22
20
31
29
14
23
45
29
10
9
(i)
287
13
(ii)
331
15
(iii)
111
5
(iv)
375
17
(v)
329
15
Question
3
3.
Heights of 10 students (in cm) are given below. Find the mean height.
136
131
125
131
126
171
165
132
129
135
(i)
1381
10
cm
(ii)
1383
10
cm
(iii)
1401
10
cm
(iv)
691
5
cm
(v)
1391
10
cm
Question
4
4.
Heights of 12 plants (in cm) are given below. Find the mean height.
52
93
93
100
50
86
86
64
88
96
70
63
(i)
965
12
cm
(ii)
953
12
cm
(iii)
943
12
cm
(iv)
941
12
cm
(v)
157
2
cm
Question
5
5.
Ages of 11 students (in years) are given below. Find the mean age.
11
14
10
14
11
11
12
14
13
14
14
(i)
149
11
years
(ii)
138
11
years
(iii)
140
11
years
(iv)
139
11
years
(v)
160
11
years
Question
6
6.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
14
11
9
12
5
15
9
13
9
6
6
14
13
13
7
(i)
57
5
mm
(ii)
54
5
mm
(iii)
53
5
mm
(iv)
52
5
mm
(v)
62
5
mm
Question
7
7.
Scores of 12 students are given below. Find the mean score.
88
83
70
79
77
82
71
73
79
77
83
78
(i)
235
3
(ii)
236
3
(iii)
79
(iv)
238
3
(v)
241
3
Question
8
8.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
26
28
30
30
31
32
26
29
34
34
(i)
28
°C
(ii)
31
°C
(iii)
30
°C
(iv)
29
°C
(v)
32
°C
Question
9
9.
Weights of 10 students (in kg) are given below. Find the mean weight.
58
54
41
50
57
60
46
48
55
43
(i)
257
5
kg
(ii)
261
5
kg
(iii)
258
5
kg
(iv)
256
5
kg
(v)
266
5
kg
Question
10
10.
Daily wages of 13 labourers (in ₹) are given below. Find the mean wage.
382
333
332
415
401
458
337
315
307
435
434
345
500
(i)
₹
385.15
(ii)
₹
384.15
(iii)
₹
384.23
(iv)
₹
386.15
(v)
₹
384.31
Question
11
11.
The arithmetic mean of
24
7
36
26
15
45
is
(i)
27.5
(ii)
26.5
(iii)
24.5
(iv)
23.5
(v)
25.5
Question
12
12.
If the mean of
9
7
8
x
6
10
2
is
6
1
7
,
find the value of x.
(i)
-1
(ii)
0
(iii)
2
(iv)
1
(v)
3
Question
13
13.
The mean of the below random sample is
31
2
5
.
Find the missing quantity.
18
19
36
16
x
42
41
29
35
40
(i)
38
(ii)
40
(iii)
36
(iv)
37
(v)
39
Question
14
14.
Given the mean of
10
samples as
11
2
5
,
what is the mean if a sample value is
increased
by
15
?
(i)
131
10
(ii)
129
10
(iii)
105
8
(iv)
127
10
(v)
51
4
Question
15
15.
Given the mean of
7
samples as
9
6
7
,
what is the mean if a sample value is
decreased
by
17
?
(i)
52
7
(ii)
54
7
(iii)
22
3
(iv)
38
5
(v)
50
7
Question
16
16.
Given the mean of
10
samples as
5
1
10
,
what is the new mean if two samples
6
and
8
are added ?
(i)
65
12
(ii)
21
4
(iii)
75
14
(iv)
11
2
(v)
67
12
Question
17
17.
Given the mean of
12
samples as
4
11
12
,
what is the new mean if two samples
2
and
3
are removed ?
(i)
27
5
(ii)
37
7
(iii)
29
5
(iv)
5
(v)
17
3
Question
18
18.
Find the mean of all prime numbers between 30 and 60.
(i)
313
7
(ii)
223
5
(iii)
311
7
(iv)
309
7
(v)
133
3
Question
19
19.
Find the mean of all prime numbers between 10 and 100.
(i)
49
(ii)
151
3
(iii)
51
(iv)
149
3
(v)
247
5
Question
20
20.
Find the mean of first 7 multiples of 3.
(i)
11
(ii)
12
(iii)
13
(iv)
10
(v)
14
Question
21
21.
Find the mean of first 8 whole numbers.
(i)
9
2
(ii)
4
(iii)
5
2
(iv)
13
4
(v)
7
2
Question
22
22.
Find the mean of first 8 multiples of 12.
(i)
56
(ii)
54
(iii)
55
(iv)
51
(v)
53
Question
23
23.
Find the mean of the first 10 odd numbers.
(i)
9
(ii)
11
(iii)
12
(iv)
8
(v)
10
Question
24
24.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
21
(iii)
24
(iv)
22
(v)
19
Question
25
25.
The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 10.
45
34
47
45
17
24
26
32
14
4
27
49
38
17
(i)
561
14
(ii)
557
14
(iii)
481
12
(iv)
559
14
(v)
637
16
Question
26
26.
The marks obtained by 10 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 5.
44
9
50
44
14
35
10
14
1
16
(i)
151
8
(ii)
187
10
(iii)
37
2
(iv)
189
10
(v)
223
12
Question
27
27.
The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
21
5
5
30
9
16
11
2
37
30
36
43
17
22
(i)
204
5
(ii)
364
9
(iii)
286
7
(iv)
284
7
(v)
282
7
Question
28
28.
If the mean of
5
samples is
25
4
5
,
what is the new mean if each number is multiplied by
4
.
(i)
722
7
(ii)
310
3
(iii)
518
5
(iv)
516
5
(v)
514
5
Question
29
29.
The mean of
8
numbers is
8
5
8
.
Upon
excluding
one number,
the mean becomes
7
.
Find the
excluded
number.
(i)
18
(ii)
19
(iii)
22
(iv)
20
(v)
21
Question
30
30.
The mean of
5
numbers is
8
4
5
.
Upon
adding
one number,
the mean becomes
7
2
3
.
Find the
included
number.
(i)
5
(ii)
2
(iii)
3
(iv)
1
(v)
-1
Assignment Key
1) (ii)
2) (ii)
3) (i)
4) (iv)
5) (ii)
6) (iv)
7) (i)
8) (iii)
9) (iv)
10) (ii)
11) (v)
12) (iv)
13) (i)
14) (ii)
15) (i)
16) (i)
17) (i)
18) (iii)
19) (iv)
20) (ii)
21) (v)
22) (ii)
23) (v)
24) (ii)
25) (iv)
26) (ii)
27) (iv)
28) (iv)
29) (iv)
30) (ii)
