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
5
x
2
4
is
5
1
5
,
find the value of x.
(i)
6
(ii)
9
(iii)
7
(iv)
5
(v)
4
Question
2
2.
The mean of the below random sample is
30
7
10
.
Find the missing quantity.
20
41
38
48
37
x
28
20
35
16
(i)
25
(ii)
22
(iii)
23
(iv)
24
(v)
27
Question
3
3.
Given the mean of
12
samples as
10
1
3
,
what is the mean if a sample value is
increased
by
15
?
(i)
117
10
(ii)
139
12
(iii)
23
2
(iv)
47
4
(v)
137
12
Question
4
4.
Given the mean of
5
samples as
10
2
5
,
what is the mean if a sample value is
decreased
by
10
?
(i)
8
(ii)
58
7
(iii)
42
5
(iv)
26
3
(v)
44
5
Question
5
5.
Given the mean of
10
samples as
7
7
10
,
what is the new mean if two samples
4
and
7
are added ?
(i)
22
3
(ii)
8
(iii)
36
5
(iv)
20
3
Question
6
6.
Given the mean of
12
samples as
5
1
6
,
what is the new mean if two samples
9
and
4
are removed ?
(i)
47
10
(ii)
51
10
(iii)
41
8
(iv)
49
10
(v)
19
4
Question
7
7.
Find the mean of all prime numbers between 40 and 60.
(i)
241
5
(ii)
339
7
(iii)
49
(iv)
243
5
Question
8
8.
Find the mean of all prime numbers between 50 and 80.
(i)
461
7
(ii)
463
7
(iii)
331
5
(iv)
465
7
(v)
595
9
Question
9
9.
Find the mean of first 7 multiples of 6.
(i)
27
(ii)
24
(iii)
22
(iv)
25
(v)
23
Question
10
10.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
3
(iii)
5
(iv)
0
(v)
2
Question
11
11.
Find the mean of first 5 multiples of 7.
(i)
20
(ii)
22
(iii)
18
(iv)
21
(v)
24
Question
12
12.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
17
(iii)
15
(iv)
13
(v)
16
Question
13
13.
Find the mean of the first 20 even numbers.
(i)
24
(ii)
20
(iii)
22
(iv)
18
(v)
21
Question
14
14.
The marks obtained by 10 students in a test are given below. Find their mean marks.
26
50
6
11
11
33
50
22
13
30
(i)
124
5
(ii)
128
5
(iii)
176
7
(iv)
76
3
(v)
126
5
Question
15
15.
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 increased by 2.
8
22
1
1
6
10
1
46
8
25
30
34
29
(i)
18
(ii)
22
(iii)
19
(iv)
17
(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 decreased by 2.
22
50
10
23
6
17
44
17
29
38
4
11
23
1
(i)
267
14
(ii)
229
12
(iii)
305
16
(iv)
269
14
(v)
265
14
Question
17
17.
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 doubled.
41
17
48
3
22
2
30
3
7
40
38
(i)
412
9
(ii)
502
11
(iii)
500
11
(iv)
592
13
(v)
504
11
Question
18
18.
Heights of 10 students (in cm) are given below. Find the mean height.
158
136
162
134
132
128
170
157
169
162
(i)
756
5
cm
(ii)
764
5
cm
(iii)
151
cm
(iv)
754
5
cm
(v)
759
5
cm
Question
19
19.
Heights of 10 plants (in cm) are given below. Find the mean height.
99
71
72
93
53
95
73
60
69
56
(i)
741
10
cm
(ii)
761
10
cm
(iii)
371
5
cm
(iv)
743
10
cm
(v)
751
10
cm
Question
20
20.
Ages of 13 students (in years) are given below. Find the mean age.
14
12
14
10
11
14
11
15
10
14
12
13
11
(i)
162
13
years
(ii)
174
13
years
(iii)
161
13
years
(iv)
187
13
years
(v)
163
13
years
Question
21
21.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
8
10
11
11
9
11
11
10
15
15
14
7
14
7
(i)
153
14
mm
(ii)
167
14
mm
(iii)
155
14
mm
(iv)
11
mm
(v)
181
14
mm
Question
22
22.
Scores of 15 students are given below. Find the mean score.
89
84
70
84
72
78
77
70
76
73
77
79
90
88
70
(i)
1177
15
(ii)
1192
15
(iii)
1207
15
(iv)
393
5
(v)
1178
15
Question
23
23.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
33
25
30
27
33
27
30
33
35
34
32
32
27
34
(i)
31
°C
(ii)
218
7
°C
(iii)
216
7
°C
(iv)
230
7
°C
(v)
223
7
°C
Question
24
24.
Weights of 14 students (in kg) are given below. Find the mean weight.
60
40
41
48
50
46
54
50
43
44
52
46
47
49
(i)
337
7
kg
(ii)
342
7
kg
(iii)
335
7
kg
(iv)
349
7
kg
(v)
48
kg
Question
25
25.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
388
472
324
442
424
421
352
476
449
459
374
370
(i)
₹
412.75
(ii)
₹
412.58
(iii)
₹
412.67
(iv)
₹
413.58
(v)
₹
414.58
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a + 2
(ii)
3a
(iii)
a
(iv)
a - 2
Question
27
27.
If the mean of
5
samples is
27
3
5
,
what is the new mean if
6
is added to each number.
(i)
234
7
(ii)
166
5
(iii)
34
(iv)
168
5
Question
28
28.
If the mean of
8
samples is
37
3
8
,
what is the new mean if
6
is subtracted from each number.
(i)
313
10
(ii)
249
8
(iii)
253
8
(iv)
63
2
(v)
251
8
Question
29
29.
If the mean of
6
samples is
28
,
what is the new mean if each number is multiplied by
7
.
(i)
197
(ii)
195
(iii)
196
(iv)
199
(v)
194
Question
30
30.
The mean of
10
numbers is
7
3
10
.
Upon
excluding
one number,
the mean becomes
7
.
Find the
excluded
number.
(i)
10
(ii)
8
(iii)
9
(iv)
12
(v)
11
Question
31
31.
The mean of
5
numbers is
11
4
5
.
Upon
adding
one number,
the mean becomes
11
5
6
.
Find the
included
number.
(i)
11
(ii)
13
(iii)
12
(iv)
14
(v)
10
Question
32
32.
The scores obtained by 8 students in a test are given below. Find the mean score.
12
18
11
3
3
8
11
6
(i)
9
(ii)
3
(iii)
15
(iv)
9
1
2
(v)
18
Question
33
33.
The arithmetic mean of
44
9
23
11
23
39
is
(i)
22.83
(ii)
23.83
(iii)
24.83
(iv)
26.83
(v)
25.83
Assignment Key
1) (i)
2) (iv)
3) (ii)
4) (iii)
5) (i)
6) (iv)
7) (iv)
8) (ii)
9) (ii)
10) (v)
11) (iv)
12) (iii)
13) (v)
14) (v)
15) (iii)
16) (i)
17) (ii)
18) (iv)
19) (i)
20) (iii)
21) (i)
22) (i)
23) (iii)
24) (iii)
25) (ii)
26) (iii)
27) (iv)
28) (v)
29) (iii)
30) (i)
31) (iii)
32) (i)
33) (iii)
