EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
1
7
8
x
3
2
9
is
5
1
7
,
find the value of x.
(i)
5
(ii)
7
(iii)
6
(iv)
3
(v)
8
Question
2
2.
The mean of the below random sample is
25
9
10
.
Find the missing quantity.
36
15
41
11
31
26
21
37
x
22
(i)
18
(ii)
22
(iii)
16
(iv)
19
(v)
20
Question
3
3.
Given the mean of
10
samples as
11
,
what is the mean if a sample value is
increased
by
14
?
(i)
62
5
(ii)
86
7
(iii)
38
3
(iv)
12
(v)
64
5
Question
4
4.
Given the mean of
14
samples as
10
1
14
,
what is the mean if a sample value is
decreased
by
20
?
(i)
17
2
(ii)
121
14
(iii)
35
4
(iv)
123
14
(v)
137
16
Question
5
5.
Given the mean of
10
samples as
6
1
5
,
what is the new mean if two samples
6
and
3
are added ?
(i)
81
14
(ii)
71
12
(iii)
73
12
(iv)
61
10
(v)
23
4
Question
6
6.
Given the mean of
12
samples as
5
1
12
,
what is the new mean if two samples
8
and
10
are removed ?
(i)
9
2
(ii)
43
10
(iii)
41
10
(iv)
35
8
(v)
17
4
Question
7
7.
Find the mean of all prime numbers between 20 and 100.
(i)
869
15
(ii)
983
17
(iii)
985
17
(iv)
1097
19
(v)
981
17
Question
8
8.
Find the mean of all prime numbers between 20 and 60.
(i)
41
(ii)
121
3
(iii)
201
5
(iv)
119
3
Question
9
9.
Find the mean of first 7 multiples of 4.
(i)
18
(ii)
13
(iii)
16
(iv)
15
(v)
17
Question
10
10.
Find the mean of first 10 whole numbers.
(i)
11
2
(ii)
7
2
(iii)
9
2
(iv)
17
4
(v)
5
Question
11
11.
Find the mean of first 5 multiples of 7.
(i)
21
(ii)
20
(iii)
23
(iv)
22
(v)
19
Question
12
12.
Find the mean of the first 10 odd numbers.
(i)
7
(ii)
12
(iii)
9
(iv)
11
(v)
10
Question
13
13.
Find the mean of the first 20 even numbers.
(i)
24
(ii)
21
(iii)
20
(iv)
22
(v)
18
Question
14
14.
The marks obtained by 11 students in a test are given below. Find their mean marks.
22
1
42
32
16
36
2
24
21
26
10
(i)
274
13
(ii)
190
9
(iii)
230
11
(iv)
234
11
(v)
232
11
Question
15
15.
The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 1.
22
1
49
41
15
20
5
12
31
39
29
(i)
24
(ii)
25
(iii)
23
(iv)
28
(v)
26
Question
16
16.
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 1.
25
16
8
47
21
7
17
1
17
26
45
27
(i)
285
14
(ii)
41
2
(iii)
245
12
(iv)
81
4
(v)
247
12
Question
17
17.
The marks obtained by 13 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
23
29
45
11
3
21
37
34
50
16
22
38
12
(i)
682
13
(ii)
262
5
(iii)
578
11
(iv)
684
13
(v)
680
13
Question
18
18.
Heights of 13 students (in cm) are given below. Find the mean height.
151
149
147
169
165
138
170
139
135
172
146
170
150
(i)
2003
13
cm
(ii)
2027
13
cm
(iii)
2001
13
cm
(iv)
154
cm
(v)
2014
13
cm
Question
19
19.
Heights of 12 plants (in cm) are given below. Find the mean height.
51
55
62
53
88
69
94
86
81
53
58
89
(i)
851
12
cm
(ii)
841
12
cm
(iii)
863
12
cm
(iv)
839
12
cm
(v)
70
cm
Question
20
20.
Ages of 14 students (in years) are given below. Find the mean age.
14
10
14
13
10
11
15
11
15
15
11
10
14
12
(i)
27
2
years
(ii)
13
years
(iii)
29
2
years
(iv)
25
2
years
Question
21
21.
Rainfall of 12 days (in mm) are given below. Find the mean rainfall.
12
7
15
7
7
14
11
6
14
13
13
14
(i)
157
12
mm
(ii)
67
6
mm
(iii)
145
12
mm
(iv)
133
12
mm
(v)
45
4
mm
Question
22
22.
Scores of 13 students are given below. Find the mean score.
79
87
85
70
90
79
82
88
89
88
88
72
88
(i)
1111
13
(ii)
1085
13
(iii)
1098
13
(iv)
1087
13
(v)
1086
13
Question
23
23.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
35
31
33
34
27
34
31
27
35
34
(i)
161
5
°C
(ii)
331
10
°C
(iii)
323
10
°C
(iv)
341
10
°C
(v)
321
10
°C
Question
24
24.
Weights of 12 students (in kg) are given below. Find the mean weight.
54
54
45
56
40
43
43
58
46
41
55
48
(i)
583
12
kg
(ii)
607
12
kg
(iii)
146
3
kg
(iv)
195
4
kg
(v)
595
12
kg
Question
25
25.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
351
343
429
339
378
314
475
399
310
437
333
418
348
300
315
(i)
₹
366.93
(ii)
₹
366.07
(iii)
₹
366.00
(iv)
₹
365.93
(v)
₹
367.93
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a
(ii)
a + 2
(iii)
3a
(iv)
a - 2
Question
27
27.
If the mean of
7
samples is
31
2
7
,
what is the new mean if
4
is added to each number.
(i)
35
(ii)
247
7
(iii)
249
7
(iv)
177
5
(v)
317
9
Question
28
28.
If the mean of
4
samples is
34
1
2
,
what is the new mean if
9
is subtracted from each number.
(i)
53
2
(ii)
101
4
(iii)
51
2
(iv)
26
(v)
49
2
Question
29
29.
If the mean of
7
samples is
21
4
7
,
what is the new mean if each number is multiplied by
10
.
(i)
216
(ii)
1510
7
(iii)
1508
7
(iv)
1940
9
Question
30
30.
The mean of
10
numbers is
12
.
Upon
excluding
one number,
the mean becomes
11
1
9
.
Find the
excluded
number.
(i)
20
(ii)
19
(iii)
17
(iv)
21
(v)
23
Question
31
31.
The mean of
6
numbers is
10
5
6
.
Upon
adding
one number,
the mean becomes
11
6
7
.
Find the
included
number.
(i)
16
(ii)
19
(iii)
21
(iv)
17
(v)
18
Question
32
32.
The scores obtained by 6 students in a test are given below. Find the mean score.
4
15
9
17
5
8
(i)
4
(ii)
8
1
2
(iii)
17
(iv)
9
2
3
(v)
13
Question
33
33.
The arithmetic mean of
6
45
45
19
21
is
(i)
26.2
(ii)
25.2
(iii)
28.2
(iv)
27.2
(v)
29.2
Assignment Key
1) (iii)
2) (iv)
3) (i)
4) (ii)
5) (ii)
6) (ii)
7) (ii)
8) (ii)
9) (iii)
10) (iii)
11) (i)
12) (v)
13) (ii)
14) (v)
15) (ii)
16) (iii)
17) (i)
18) (iii)
19) (iv)
20) (iv)
21) (iv)
22) (ii)
23) (v)
24) (i)
25) (iv)
26) (i)
27) (ii)
28) (iii)
29) (ii)
30) (i)
31) (v)
32) (iv)
33) (iv)
