EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
9
1
7
10
x
6
2
3
is
5
3
8
,
find the value of x.
(i)
4
(ii)
5
(iii)
2
(iv)
8
(v)
6
Question
2
2.
The mean of the below random sample is
24
3
10
.
Find the missing quantity.
21
23
x
41
21
41
31
15
14
14
(i)
22
(ii)
23
(iii)
21
(iv)
20
(v)
25
Question
3
3.
Given the mean of
14
samples as
8
,
what is the mean if a sample value is
increased
by
18
?
(i)
65
7
(ii)
9
(iii)
47
5
(iv)
67
7
(v)
83
9
Question
4
4.
Given the mean of
8
samples as
12
7
8
,
what is the mean if a sample value is
decreased
by
15
?
(i)
10
(ii)
11
(iii)
8
(iv)
13
(v)
12
Question
5
5.
Given the mean of
10
samples as
7
1
5
,
what is the new mean if two samples
8
and
4
are added ?
(i)
10
(ii)
4
(iii)
6
(iv)
8
(v)
7
Question
6
6.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
8
and
10
are removed ?
(i)
26
5
(ii)
22
5
(iii)
16
3
(iv)
32
7
(v)
24
5
Question
7
7.
Find the mean of all prime numbers between 50 and 90.
(i)
635
9
(ii)
775
11
(iii)
211
3
(iv)
637
9
(v)
495
7
Question
8
8.
Find the mean of all prime numbers between 40 and 80.
(i)
297
5
(ii)
299
5
(iii)
59
(iv)
179
3
(v)
415
7
Question
9
9.
Find the mean of first 10 multiples of 18.
(i)
100
(ii)
102
(iii)
99
(iv)
96
(v)
98
Question
10
10.
Find the mean of first 6 whole numbers.
(i)
3
2
(ii)
3
(iii)
7
2
(iv)
5
2
(v)
9
4
Question
11
11.
Find the mean of first 8 multiples of 3.
(i)
25
2
(ii)
29
2
(iii)
14
(iv)
53
4
(v)
27
2
Question
12
12.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
17
(iii)
16
(iv)
13
(v)
15
Question
13
13.
Find the mean of the first 20 even numbers.
(i)
21
(ii)
23
(iii)
22
(iv)
19
(v)
20
Question
14
14.
The marks obtained by 14 students in a test are given below. Find their mean marks.
4
34
19
3
35
20
6
6
16
21
4
10
25
33
(i)
86
5
(ii)
118
7
(iii)
120
7
(iv)
50
3
(v)
116
7
Question
15
15.
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 increased by 5.
22
23
37
44
27
47
12
4
25
49
(i)
34
(ii)
33
(iii)
37
(iv)
35
(v)
31
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 9.
26
4
40
41
16
35
5
47
11
1
12
48
(i)
91
6
(ii)
117
8
(iii)
89
6
(iv)
61
4
(v)
29
2
Question
17
17.
The marks obtained by 15 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
27
40
43
22
25
17
46
50
7
25
2
34
22
29
10
(i)
160
3
(ii)
268
5
(iii)
264
5
(iv)
372
7
(v)
266
5
Question
18
18.
Heights of 15 students (in cm) are given below. Find the mean height.
126
132
142
146
143
167
164
128
152
149
175
142
135
161
147
(i)
2239
15
cm
(ii)
442
3
cm
(iii)
737
5
cm
(iv)
2209
15
cm
(v)
2224
15
cm
Question
19
19.
Heights of 14 plants (in cm) are given below. Find the mean height.
92
84
90
76
68
55
75
60
59
71
55
92
57
79
(i)
1027
14
cm
(ii)
145
2
cm
(iii)
1041
14
cm
(iv)
1013
14
cm
(v)
507
7
cm
Question
20
20.
Ages of 13 students (in years) are given below. Find the mean age.
13
13
14
10
14
13
12
15
13
14
10
13
11
(i)
166
13
years
(ii)
165
13
years
(iii)
167
13
years
(iv)
191
13
years
(v)
178
13
years
Question
21
21.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
7
15
9
6
12
9
6
12
8
11
13
11
10
13
14
(i)
53
5
mm
(ii)
57
5
mm
(iii)
54
5
mm
(iv)
62
5
mm
(v)
52
5
mm
Question
22
22.
Scores of 15 students are given below. Find the mean score.
72
83
73
75
74
77
71
82
83
76
79
80
77
74
80
(i)
1171
15
(ii)
1156
15
(iii)
386
5
(iv)
1157
15
(v)
1186
15
Question
23
23.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
35
25
34
27
33
33
29
30
32
31
26
(i)
357
11
°C
(ii)
336
11
°C
(iii)
337
11
°C
(iv)
346
11
°C
(v)
335
11
°C
Question
24
24.
Weights of 13 students (in kg) are given below. Find the mean weight.
43
50
60
53
40
42
55
53
50
59
57
52
48
(i)
688
13
kg
(ii)
675
13
kg
(iii)
51
kg
(iv)
662
13
kg
(v)
664
13
kg
Question
25
25.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
485
405
371
311
392
398
452
478
370
429
483
408
372
365
414
(i)
₹
408.93
(ii)
₹
408.87
(iii)
₹
409.00
(iv)
₹
409.87
(v)
₹
410.87
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
3a
(ii)
a + 2
(iii)
a
(iv)
a - 2
Question
27
27.
If the mean of
4
samples is
23
1
4
,
what is the new mean if
10
is added to each number.
(i)
135
4
(ii)
133
4
(iii)
131
4
(iv)
67
2
(v)
199
6
Question
28
28.
If the mean of
4
samples is
27
1
4
,
what is the new mean if
3
is subtracted from each number.
(i)
49
2
(ii)
97
4
(iii)
145
6
(iv)
99
4
(v)
95
4
Question
29
29.
If the mean of
8
samples is
24
3
8
,
what is the new mean if each number is multiplied by
5
.
(i)
1217
10
(ii)
973
8
(iii)
977
8
(iv)
733
6
(v)
975
8
Question
30
30.
The mean of
5
numbers is
13
4
5
.
Upon
excluding
one number,
the mean becomes
14
1
2
.
Find the
excluded
number.
(i)
11
(ii)
12
(iii)
13
(iv)
8
(v)
10
Question
31
31.
The mean of
5
numbers is
6
1
5
.
Upon
adding
one number,
the mean becomes
5
1
2
.
Find the
included
number.
(i)
-1
(ii)
2
(iii)
1
(iv)
3
(v)
4
Question
32
32.
The scores obtained by 14 students in a test are given below. Find the mean score.
6
16
7
1
9
2
3
7
15
18
15
7
12
15
(i)
8
(ii)
1
(iii)
17
(iv)
9
1
2
(v)
18
Question
33
33.
The arithmetic mean of
28
43
39
29
12
38
36
31
is
(i)
33
(ii)
30
(iii)
34
(iv)
32
(v)
31
Assignment Key
1) (ii)
2) (i)
3) (i)
4) (ii)
5) (v)
6) (v)
7) (i)
8) (i)
9) (iii)
10) (iv)
11) (v)
12) (v)
13) (i)
14) (ii)
15) (i)
16) (iii)
17) (v)
18) (iv)
19) (iv)
20) (ii)
21) (v)
22) (ii)
23) (v)
24) (iv)
25) (ii)
26) (iii)
27) (ii)
28) (ii)
29) (v)
30) (i)
31) (ii)
32) (iv)
33) (iv)
