EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Mean and Median of Ungrouped Data
Grade : ICSE Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 8 students in a test are given below. Find the mean score.
9
12
10
11
17
3
3
3
(i)
9
1
2
(ii)
14
(iii)
3
(iv)
8
1
2
(v)
17
Question
2
2.
If the mean of
9
5
3
x
8
7
is
7
,
find the value of x.
(i)
11
(ii)
9
(iii)
13
(iv)
10
(v)
8
Question
3
3.
The mean of the below random sample is
28
1
2
.
Find the missing quantity.
x
42
38
38
44
11
18
19
30
27
(i)
18
(ii)
21
(iii)
17
(iv)
19
(v)
16
Question
4
4.
Given the mean of
11
samples as
10
1
11
,
what is the mean if a sample value is
increased
by
16
?
(i)
127
11
(ii)
35
3
(iii)
149
13
(iv)
125
11
(v)
129
11
Question
5
5.
Given the mean of
15
samples as
11
8
15
,
what is the mean if a sample value is
decreased
by
14
?
(i)
11
(ii)
73
7
(iii)
51
5
(iv)
53
5
Question
6
6.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
4
and
9
are added ?
(i)
5
(ii)
19
3
(iii)
7
(iv)
17
3
(v)
27
5
Question
7
7.
Given the mean of
12
samples as
4
1
3
,
what is the new mean if two samples
3
and
5
are removed ?
(i)
4
(ii)
22
5
(iii)
24
5
(iv)
30
7
(v)
14
3
Question
8
8.
Find the mean of all prime numbers between 50 and 60.
(i)
57
(ii)
56
(iii)
55
(iv)
53
(v)
58
Question
9
9.
Find the mean of all prime numbers between 50 and 60.
(i)
53
(ii)
57
(iii)
55
(iv)
56
(v)
59
Question
10
10.
Find the mean of first 8 multiples of 6.
(i)
27
(ii)
28
(iii)
26
(iv)
25
(v)
29
Question
11
11.
Find the mean of first 10 whole numbers.
(i)
17
4
(ii)
7
2
(iii)
5
(iv)
11
2
(v)
9
2
Question
12
12.
Find the mean of first 8 multiples of 4.
(i)
18
(ii)
16
(iii)
19
(iv)
20
(v)
17
Question
13
13.
Find the mean of the first 10 odd numbers.
(i)
7
(ii)
9
(iii)
12
(iv)
11
(v)
10
Question
14
14.
Find the mean of the first 15 even numbers.
(i)
17
(ii)
14
(iii)
19
(iv)
16
(v)
15
Question
15
15.
The marks obtained by 14 students in a test are given below. Find their mean marks.
21
35
38
39
16
36
26
30
42
1
10
30
47
39
(i)
205
7
(ii)
147
5
(iii)
29
(iv)
207
7
(v)
263
9
Question
16
16.
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 1.
14
4
46
6
15
10
24
3
45
34
(i)
211
10
(ii)
253
12
(iii)
209
10
(iv)
169
8
(v)
213
10
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 7.
5
41
27
37
31
33
17
19
49
35
40
33
(i)
95
4
(ii)
237
10
(iii)
283
12
(iv)
281
12
(v)
47
2
Question
18
18.
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 doubled.
33
34
3
9
28
29
5
37
27
34
(i)
333
7
(ii)
241
5
(iii)
239
5
(iv)
145
3
(v)
237
5
Question
19
19.
Heights of 15 students (in cm) are given below. Find the mean height.
125
146
139
174
172
137
163
161
150
146
130
132
164
142
152
(i)
2263
15
cm
(ii)
149
cm
(iii)
2248
15
cm
(iv)
2234
15
cm
(v)
2233
15
cm
Question
20
20.
Heights of 11 plants (in cm) are given below. Find the mean height.
75
61
89
69
59
79
72
73
63
98
58
(i)
798
11
cm
(ii)
818
11
cm
(iii)
796
11
cm
(iv)
797
11
cm
(v)
807
11
cm
Question
21
21.
Ages of 13 students (in years) are given below. Find the mean age.
13
14
15
13
12
11
11
14
13
15
15
15
12
(i)
173
13
years
(ii)
174
13
years
(iii)
186
13
years
(iv)
199
13
years
(v)
175
13
years
Question
22
22.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
9
5
12
14
8
10
8
11
9
6
(i)
47
5
mm
(ii)
46
5
mm
(iii)
51
5
mm
(iv)
56
5
mm
(v)
48
5
mm
Question
23
23.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
33
31
29
31
31
27
27
30
25
29
25
(i)
29
°C
(ii)
340
11
°C
(iii)
320
11
°C
(iv)
318
11
°C
(v)
329
11
°C
Question
24
24.
Weights of 14 students (in kg) are given below. Find the mean weight.
40
60
51
56
42
43
60
55
47
59
49
54
56
56
(i)
51
kg
(ii)
53
kg
(iii)
52
kg
(iv)
50
kg
(v)
54
kg
Question
25
25.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
440
327
480
459
466
334
427
483
413
360
460
(i)
₹
424.64
(ii)
₹
422.73
(iii)
₹
423.64
(iv)
₹
422.82
(v)
₹
422.64
Question
26
26.
If the mean of
7
samples is
24
,
what is the new mean if
10
is added to each number.
(i)
34
(ii)
32
(iii)
33
(iv)
35
(v)
36
Question
27
27.
If the mean of
4
samples is
16
3
4
,
what is the new mean if
4
is subtracted from each number.
(i)
27
2
(ii)
25
2
(iii)
49
4
(iv)
53
4
(v)
51
4
Question
28
28.
If the mean of
4
samples is
28
1
4
,
what is the new mean if each number is multiplied by
9
.
(i)
1525
6
(ii)
509
2
(iii)
1017
4
(iv)
1019
4
(v)
1015
4
Question
29
29.
The mean of
5
numbers is
7
.
Upon
adding
one number,
the mean becomes
6
.
Find the
included
number.
(i)
3
(ii)
2
(iii)
0
(iv)
1
(v)
-1
Question
30
30.
Scores of 15 students are given below. Find the mean score.
74
82
88
90
86
82
74
85
73
89
88
86
86
70
82
(i)
248
3
(ii)
253
3
(iii)
247
3
(iv)
83
(v)
250
3
Question
31
31.
The mean of
5
numbers is
9
1
5
.
Upon
excluding
one number,
the mean becomes
8
.
Find the
excluded
number.
(i)
15
(ii)
14
(iii)
13
(iv)
11
(v)
16
Assignment Key
1) (iv)
2) (iv)
3) (i)
4) (i)
5) (iv)
6) (iv)
7) (ii)
8) (ii)
9) (iv)
10) (i)
11) (v)
12) (i)
13) (v)
14) (iv)
15) (i)
16) (i)
17) (iii)
18) (iii)
19) (v)
20) (iii)
21) (i)
22) (ii)
23) (iv)
24) (iii)
25) (v)
26) (i)
27) (v)
28) (iii)
29) (iv)
30) (iii)
31) (ii)
