EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
4
8
3
x
7
1
is
5
1
2
,
find the value of x.
(i)
9
(ii)
8
(iii)
11
(iv)
12
(v)
10
Question
2
2.
The mean of the below random sample is
31
2
5
.
Find the missing quantity.
49
36
x
40
24
36
45
12
27
18
(i)
28
(ii)
29
(iii)
26
(iv)
25
(v)
27
Question
3
3.
Given the mean of
12
samples as
14
3
4
,
what is the mean if a sample value is
increased
by
20
?
(i)
199
12
(ii)
33
2
(iii)
65
4
(iv)
197
12
(v)
229
14
Question
4
4.
Given the mean of
12
samples as
11
1
4
,
what is the mean if a sample value is
decreased
by
17
?
(i)
61
6
(ii)
19
2
(iii)
59
6
(iv)
77
8
(v)
41
4
Question
5
5.
Given the mean of
10
samples as
4
3
10
,
what is the new mean if two samples
4
and
9
are added ?
(i)
6
(ii)
16
3
(iii)
14
3
(iv)
22
5
(v)
4
Question
6
6.
Given the mean of
12
samples as
5
,
what is the new mean if two samples
1
and
10
are removed ?
(i)
49
10
(ii)
51
10
(iii)
41
8
(iv)
47
10
(v)
19
4
Question
7
7.
Find the mean of all prime numbers between 50 and 100.
(i)
364
5
(ii)
512
7
(iii)
220
3
(iv)
368
5
(v)
366
5
Question
8
8.
Find the mean of all prime numbers between 50 and 100.
(i)
364
5
(ii)
512
7
(iii)
220
3
(iv)
366
5
(v)
368
5
Question
9
9.
Find the mean of first 8 multiples of 17.
(i)
305
4
(ii)
77
(iii)
155
2
(iv)
151
2
(v)
153
2
Question
10
10.
Find the mean of first 6 whole numbers.
(i)
3
2
(ii)
5
2
(iii)
3
(iv)
9
4
(v)
7
2
Question
11
11.
Find the mean of first 8 multiples of 4.
(i)
17
(ii)
18
(iii)
20
(iv)
16
(v)
19
Question
12
12.
Find the mean of the first 15 odd numbers.
(i)
13
(ii)
17
(iii)
15
(iv)
16
(v)
14
Question
13
13.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
22
(iii)
21
(iv)
23
(v)
19
Question
14
14.
The marks obtained by 10 students in a test are given below. Find their mean marks.
10
14
15
40
4
4
1
3
10
25
(i)
61
5
(ii)
87
7
(iii)
13
(iv)
63
5
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 10.
31
35
28
12
39
15
2
12
17
33
45
(i)
377
11
(ii)
381
11
(iii)
379
11
(iv)
311
9
(v)
447
13
Question
16
16.
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 decreased by 5.
26
7
33
37
44
47
35
48
11
12
21
17
22
(i)
293
13
(ii)
113
5
(iii)
251
11
(iv)
297
13
(v)
295
13
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 doubled.
6
15
23
30
28
44
48
29
50
2
14
3
(i)
50
(ii)
148
3
(iii)
48
(iv)
146
3
(v)
242
5
Question
18
18.
Heights of 13 students (in cm) are given below. Find the mean height.
171
155
142
144
173
165
143
142
163
147
132
136
172
(i)
1985
13
cm
(ii)
2011
13
cm
(iii)
1986
13
cm
(iv)
1998
13
cm
(v)
1987
13
cm
Question
19
19.
Heights of 11 plants (in cm) are given below. Find the mean height.
71
84
85
63
87
91
98
75
99
97
83
(i)
934
11
cm
(ii)
955
11
cm
(iii)
933
11
cm
(iv)
944
11
cm
(v)
85
cm
Question
20
20.
Ages of 10 students (in years) are given below. Find the mean age.
10
13
12
15
14
14
10
10
10
11
(i)
139
10
years
(ii)
129
10
years
(iii)
119
10
years
(iv)
12
years
(v)
121
10
years
Question
21
21.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
8
11
5
13
5
9
12
10
12
10
13
14
11
11
8
(i)
152
15
mm
(ii)
167
15
mm
(iii)
182
15
mm
(iv)
51
5
mm
(v)
154
15
mm
Question
22
22.
Scores of 10 students are given below. Find the mean score.
76
81
70
80
85
86
83
81
87
73
(i)
401
5
(ii)
406
5
(iii)
403
5
(iv)
411
5
(v)
402
5
Question
23
23.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
29
26
32
26
29
34
27
28
34
27
33
33
28
(i)
388
13
°C
(ii)
399
13
°C
(iii)
387
13
°C
(iv)
412
13
°C
(v)
386
13
°C
Question
24
24.
Weights of 12 students (in kg) are given below. Find the mean weight.
40
43
56
42
43
50
43
55
56
51
52
53
(i)
49
kg
(ii)
148
3
kg
(iii)
152
3
kg
(iv)
146
3
kg
(v)
149
3
kg
Question
25
25.
Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.
500
386
330
336
422
411
329
489
351
477
441
465
307
333
(i)
₹
398.43
(ii)
₹
398.36
(iii)
₹
399.36
(iv)
₹
398.50
(v)
₹
400.36
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a - 2
(ii)
a + 2
(iii)
a
(iv)
3a
Question
27
27.
If the mean of
5
samples is
18
,
what is the new mean if
6
is added to each number.
(i)
25
(ii)
27
(iii)
23
(iv)
24
(v)
22
Question
28
28.
If the mean of
5
samples is
17
1
5
,
what is the new mean if
8
is subtracted from each number.
(i)
64
7
(ii)
48
5
(iii)
28
3
(iv)
44
5
(v)
46
5
Question
29
29.
If the mean of
8
samples is
34
1
4
,
what is the new mean if each number is multiplied by
3
.
(i)
409
4
(ii)
411
4
(iii)
413
4
(iv)
205
2
(v)
207
2
Question
30
30.
The mean of
8
numbers is
7
.
Upon
excluding
one number,
the mean becomes
7
4
7
.
Find the
excluded
number.
(i)
0
(ii)
5
(iii)
2
(iv)
3
(v)
4
Question
31
31.
The mean of
7
numbers is
13
3
7
.
Upon
adding
one number,
the mean becomes
14
1
8
.
Find the
included
number.
(i)
18
(ii)
19
(iii)
21
(iv)
20
(v)
17
Question
32
32.
The scores obtained by 14 students in a test are given below. Find the mean score.
16
6
13
3
2
9
11
17
6
18
6
2
3
18
(i)
2
(ii)
18
(iii)
6
(iv)
16
(v)
9
2
7
Question
33
33.
The arithmetic mean of
40
32
4
45
38
is
(i)
29.8
(ii)
32.8
(iii)
30.8
(iv)
31.8
(v)
33.8
Assignment Key
1) (v)
2) (v)
3) (iv)
4) (iii)
5) (iii)
6) (i)
7) (v)
8) (iv)
9) (v)
10) (ii)
11) (ii)
12) (iii)
13) (iii)
14) (iv)
15) (iii)
16) (v)
17) (iv)
18) (i)
19) (iii)
20) (iii)
21) (i)
22) (i)
23) (v)
24) (iv)
25) (ii)
26) (iii)
27) (iv)
28) (v)
29) (ii)
30) (iv)
31) (ii)
32) (v)
33) (iv)
