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 11 students in a test are given below. Find the mean score.
6
10
2
7
18
16
2
13
12
13
8
(i)
9
8
11
(ii)
16
(iii)
2
(iv)
10
(v)
18
Question
2
2.
If the mean of
5
3
10
x
7
8
is
7
,
find the value of x.
(i)
9
(ii)
7
(iii)
12
(iv)
10
(v)
8
Question
3
3.
The mean of the below random sample is
34
1
2
.
Find the missing quantity.
29
48
25
x
33
35
40
43
12
46
(i)
33
(ii)
35
(iii)
36
(iv)
34
(v)
31
Question
4
4.
Given the mean of
7
samples as
8
5
7
,
what is the mean if a sample value is
increased
by
20
?
(i)
83
7
(ii)
81
7
(iii)
59
5
(iv)
79
7
(v)
103
9
Question
5
5.
Given the mean of
15
samples as
8
1
3
,
what is the mean if a sample value is
decreased
by
18
?
(i)
109
15
(ii)
107
15
(iii)
121
17
(iv)
7
(v)
93
13
Question
6
6.
Given the mean of
10
samples as
6
3
5
,
what is the new mean if two samples
1
and
9
are added ?
(i)
7
(ii)
31
5
(iii)
19
3
(iv)
17
3
Question
7
7.
Given the mean of
12
samples as
5
1
12
,
what is the new mean if two samples
6
and
8
are removed ?
(i)
49
10
(ii)
39
8
(iii)
55
12
(iv)
9
2
(v)
47
10
Question
8
8.
Find the mean of all prime numbers between 10 and 70.
(i)
553
15
(ii)
551
15
(iii)
183
5
(iv)
479
13
(v)
623
17
Question
9
9.
Find the mean of all prime numbers between 10 and 90.
(i)
471
10
(ii)
473
10
(iii)
189
4
(iv)
95
2
(v)
379
8
Question
10
10.
Find the mean of first 7 multiples of 18.
(i)
72
(ii)
70
(iii)
75
(iv)
73
(v)
71
Question
11
11.
Find the mean of first 5 whole numbers.
(i)
2
(ii)
3
(iii)
5
(iv)
1
(v)
-1
Question
12
12.
Find the mean of first 8 multiples of 5.
(i)
47
2
(ii)
89
4
(iii)
23
(iv)
45
2
(v)
43
2
Question
13
13.
Find the mean of the first 20 odd numbers.
(i)
20
(ii)
21
(iii)
19
(iv)
18
(v)
22
Question
14
14.
Find the mean of the first 10 even numbers.
(i)
11
(ii)
14
(iii)
12
(iv)
10
(v)
8
Question
15
15.
The marks obtained by 11 students in a test are given below. Find their mean marks.
35
20
50
40
30
15
50
9
25
23
16
(i)
315
11
(ii)
257
9
(iii)
313
11
(iv)
311
11
(v)
369
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 increased by 9.
37
37
3
2
13
28
47
20
8
12
36
26
2
(i)
30
(ii)
386
13
(iii)
446
15
(iv)
388
13
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 decreased by 2.
3
36
43
46
29
9
32
25
21
22
8
26
42
23
43
(i)
128
5
(ii)
124
5
(iii)
76
3
(iv)
176
7
(v)
126
5
Question
18
18.
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.
50
19
48
22
14
12
6
36
47
24
14
2
(i)
47
(ii)
52
(iii)
49
(iv)
50
(v)
48
Question
19
19.
Heights of 10 students (in cm) are given below. Find the mean height.
159
152
127
173
163
129
150
152
125
136
(i)
738
5
cm
(ii)
734
5
cm
(iii)
147
cm
(iv)
743
5
cm
(v)
733
5
cm
Question
20
20.
Heights of 12 plants (in cm) are given below. Find the mean height.
63
58
64
69
69
63
90
78
59
74
95
51
(i)
845
12
cm
(ii)
857
12
cm
(iii)
833
12
cm
(iv)
139
2
cm
(v)
835
12
cm
Question
21
21.
Ages of 11 students (in years) are given below. Find the mean age.
15
12
15
15
12
10
10
14
11
10
14
(i)
140
11
years
(ii)
160
11
years
(iii)
139
11
years
(iv)
138
11
years
(v)
149
11
years
Question
22
22.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
13
10
12
6
6
6
14
13
15
7
7
10
6
9
12
(i)
161
15
mm
(ii)
176
15
mm
(iii)
148
15
mm
(iv)
49
5
mm
(v)
146
15
mm
Question
23
23.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
25
33
33
29
26
32
29
33
30
28
34
27
30
(i)
30
°C
(ii)
415
13
°C
(iii)
402
13
°C
(iv)
389
13
°C
(v)
391
13
°C
Question
24
24.
Weights of 10 students (in kg) are given below. Find the mean weight.
46
42
48
48
47
60
51
44
46
46
(i)
241
5
kg
(ii)
239
5
kg
(iii)
249
5
kg
(iv)
244
5
kg
(v)
48
kg
Question
25
25.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
319
457
369
347
479
308
326
357
442
373
(i)
₹
377.90
(ii)
₹
378.70
(iii)
₹
377.70
(iv)
₹
379.70
(v)
₹
377.80
Question
26
26.
If the mean of
8
samples is
36
3
8
,
what is the new mean if
6
is added to each number.
(i)
423
10
(ii)
337
8
(iii)
85
2
(iv)
339
8
(v)
341
8
Question
27
27.
If the mean of
8
samples is
24
5
8
,
what is the new mean if
9
is subtracted from each number.
(i)
127
8
(ii)
31
2
(iii)
125
8
(iv)
123
8
(v)
95
6
Question
28
28.
If the mean of
7
samples is
24
4
7
,
what is the new mean if each number is multiplied by
6
.
(i)
1034
7
(ii)
1032
7
(iii)
738
5
(iv)
1030
7
(v)
442
3
Question
29
29.
The mean of
7
numbers is
7
3
7
.
Upon
adding
one number,
the mean becomes
7
1
2
.
Find the
included
number.
(i)
9
(ii)
8
(iii)
10
(iv)
7
(v)
5
Question
30
30.
Scores of 15 students are given below. Find the mean score.
82
90
72
77
74
84
90
77
87
89
79
82
80
89
70
(i)
408
5
(ii)
1223
15
(iii)
1237
15
(iv)
1222
15
(v)
1252
15
Question
31
31.
The mean of
10
numbers is
9
9
10
.
Upon
excluding
one number,
the mean becomes
10
.
Find the
excluded
number.
(i)
8
(ii)
9
(iii)
10
(iv)
11
(v)
7
Assignment Key
1) (i)
2) (i)
3) (iv)
4) (ii)
5) (ii)
6) (iii)
7) (v)
8) (ii)
9) (ii)
10) (i)
11) (i)
12) (iv)
13) (i)
14) (i)
15) (iii)
16) (iv)
17) (v)
18) (iii)
19) (v)
20) (iii)
21) (iv)
22) (v)
23) (iv)
24) (ii)
25) (iii)
26) (iv)
27) (iii)
28) (ii)
29) (ii)
30) (iv)
31) (ii)
