EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : ICSE Grade VIII
License : Non Commercial Use
Question
1
1.
The scores obtained by 14 students in a test are given below. Find the mean score.
20
2
6
5
4
16
19
10
2
8
12
19
6
18
(i)
9
(ii)
18
(iii)
10
1
2
(iv)
20
(v)
2
Question
2
2.
If the mean of
7
3
1
x
6
2
is
4
,
find the value of x.
(i)
5
(ii)
8
(iii)
2
(iv)
4
(v)
6
Question
3
3.
The mean of the below random sample is
22
4
5
.
Find the missing quantity.
x
10
15
17
50
30
11
21
34
30
(i)
8
(ii)
10
(iii)
9
(iv)
12
(v)
11
Question
4
4.
Given the mean of
14
samples as
9
1
2
,
what is the mean if a sample value is
increased
by
17
?
(i)
73
7
(ii)
11
(iii)
95
9
(iv)
75
7
Question
5
5.
Given the mean of
6
samples as
12
1
6
,
what is the mean if a sample value is
decreased
by
11
?
(i)
29
3
(ii)
51
5
(iii)
11
(iv)
31
3
Question
6
6.
Given the mean of
10
samples as
5
2
5
,
what is the new mean if two samples
6
and
1
are added ?
(i)
61
12
(ii)
21
4
(iii)
59
12
(iv)
51
10
(v)
71
14
Question
7
7.
Given the mean of
12
samples as
4
1
12
,
what is the new mean if two samples
5
and
4
are removed ?
(i)
6
(ii)
3
(iii)
1
(iv)
4
(v)
5
Question
8
8.
Find the mean of all prime numbers between 50 and 90.
(i)
495
7
(ii)
635
9
(iii)
637
9
(iv)
775
11
(v)
211
3
Question
9
9.
Find the mean of all prime numbers between 30 and 60.
(i)
311
7
(ii)
133
3
(iii)
309
7
(iv)
223
5
(v)
313
7
Question
10
10.
Find the mean of first 5 multiples of 6.
(i)
19
(ii)
18
(iii)
17
(iv)
15
(v)
20
Question
11
11.
Find the mean of first 7 whole numbers.
(i)
1
(ii)
4
(iii)
3
(iv)
5
(v)
2
Question
12
12.
Find the mean of first 8 multiples of 11.
(i)
50
(ii)
97
2
(iii)
99
2
(iv)
197
4
(v)
101
2
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
16
(iii)
18
(iv)
15
(v)
13
Question
14
14.
Find the mean of the first 10 even numbers.
(i)
14
(ii)
9
(iii)
12
(iv)
11
(v)
10
Question
15
15.
The marks obtained by 11 students in a test are given below. Find their mean marks.
5
15
33
4
6
35
37
29
14
41
34
(i)
25
(ii)
23
(iii)
22
(iv)
24
(v)
20
Question
16
16.
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.
23
35
23
37
14
49
24
35
4
34
9
44
38
8
(i)
517
14
(ii)
519
14
(iii)
589
16
(iv)
445
12
(v)
515
14
Question
17
17.
The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 4.
34
18
18
47
50
21
37
18
37
43
29
37
(i)
113
4
(ii)
341
12
(iii)
397
14
(iv)
343
12
(v)
57
2
Question
18
18.
The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
2
43
30
19
36
28
6
1
23
29
20
18
(i)
87
2
(ii)
83
2
(iii)
169
4
(iv)
85
2
(v)
43
Question
19
19.
Heights of 13 students (in cm) are given below. Find the mean height.
133
149
142
164
136
160
151
127
150
149
167
149
134
(i)
147
cm
(ii)
149
cm
(iii)
148
cm
(iv)
145
cm
(v)
146
cm
Question
20
20.
Heights of 12 plants (in cm) are given below. Find the mean height.
63
82
71
63
73
81
76
57
73
80
87
76
(i)
147
2
cm
(ii)
74
cm
(iii)
149
2
cm
(iv)
151
2
cm
Question
21
21.
Ages of 15 students (in years) are given below. Find the mean age.
13
15
13
11
12
11
12
12
12
10
13
12
14
14
10
(i)
184
15
years
(ii)
214
15
years
(iii)
199
15
years
(iv)
62
5
years
(v)
37
3
years
Question
22
22.
Rainfall of 12 days (in mm) are given below. Find the mean rainfall.
5
10
14
7
12
5
12
9
9
5
9
10
(i)
9
mm
(ii)
107
12
mm
(iii)
131
12
mm
(iv)
119
12
mm
(v)
109
12
mm
Question
23
23.
Scores of 13 students are given below. Find the mean score.
87
72
85
82
83
70
82
90
85
75
84
87
77
(i)
1060
13
(ii)
1061
13
(iii)
1085
13
(iv)
1059
13
(v)
1072
13
Question
24
24.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
33
33
35
25
31
33
35
27
29
33
25
(i)
31
°C
(ii)
361
11
°C
(iii)
340
11
°C
(iv)
350
11
°C
(v)
339
11
°C
Question
25
25.
Weights of 10 students (in kg) are given below. Find the mean weight.
50
57
59
40
56
58
44
45
43
56
(i)
256
5
kg
(ii)
51
kg
(iii)
254
5
kg
(iv)
259
5
kg
(v)
264
5
kg
Question
26
26.
Daily wages of 13 labourers (in ₹) are given below. Find the mean wage.
356
406
395
350
476
374
467
392
378
466
399
433
437
(i)
₹
410.00
(ii)
₹
410.92
(iii)
₹
409.92
(iv)
₹
410.08
(v)
₹
411.92
Question
27
27.
The arithmetic mean of
24
50
12
15
13
11
10
39
is
(i)
22.75
(ii)
21.75
(iii)
19.75
(iv)
23.75
(v)
20.75
Question
28
28.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
3a
(ii)
a
(iii)
a + 2
(iv)
a - 2
Question
29
29.
If the mean of
6
samples is
20
2
3
,
what is the new mean if
3
is added to each number.
(i)
23
(ii)
71
3
(iii)
25
(iv)
117
5
(v)
73
3
Question
30
30.
If the mean of
6
samples is
29
1
2
,
what is the new mean if
4
is subtracted from each number.
(i)
49
2
(ii)
53
2
(iii)
51
2
(iv)
26
(v)
101
4
Question
31
31.
If the mean of
4
samples is
23
1
2
,
what is the new mean if each number is multiplied by
8
.
(i)
188
(ii)
187
(iii)
190
(iv)
189
(v)
185
Question
32
32.
The mean of
6
numbers is
7
5
6
.
Upon
excluding
one number,
the mean becomes
7
.
Find the
excluded
number.
(i)
11
(ii)
12
(iii)
15
(iv)
13
(v)
9
Question
33
33.
The mean of
8
numbers is
9
.
Upon
adding
one number,
the mean becomes
9
4
9
.
Find the
included
number.
(i)
14
(ii)
11
(iii)
16
(iv)
12
(v)
13
Assignment Key
1) (iii)
2) (i)
3) (ii)
4) (iv)
5) (iv)
6) (i)
7) (iv)
8) (ii)
9) (i)
10) (ii)
11) (iii)
12) (iii)
13) (iv)
14) (iv)
15) (ii)
16) (i)
17) (ii)
18) (iv)
19) (i)
20) (i)
21) (i)
22) (ii)
23) (iv)
24) (v)
25) (iii)
26) (iii)
27) (ii)
28) (ii)
29) (ii)
30) (iii)
31) (i)
32) (ii)
33) (v)
