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 14 students in a test are given below. Find the mean score.
8
16
19
16
9
10
12
12
2
1
8
2
14
8
(i)
9
1
2
(ii)
18
(iii)
9
11
14
(iv)
19
(v)
1
Question
2
2.
If the mean of
8
3
9
x
5
1
4
is
5
5
7
,
find the value of x.
(i)
10
(ii)
9
(iii)
12
(iv)
11
(v)
7
Question
3
3.
The mean of the below random sample is
35
4
5
.
Find the missing quantity.
15
47
32
38
36
x
32
40
34
43
(i)
42
(ii)
39
(iii)
40
(iv)
44
(v)
41
Question
4
4.
Given the mean of
9
samples as
7
2
9
,
what is the mean if a sample value is
increased
by
12
?
(i)
77
9
(ii)
61
7
(iii)
25
3
(iv)
79
9
(v)
93
11
Question
5
5.
Given the mean of
7
samples as
11
5
7
,
what is the mean if a sample value is
decreased
by
18
?
(i)
82
9
(ii)
66
7
(iii)
64
7
(iv)
46
5
(v)
62
7
Question
6
6.
Given the mean of
10
samples as
6
,
what is the new mean if two samples
5
and
3
are added ?
(i)
17
3
(ii)
19
3
(iii)
7
(iv)
27
5
(v)
5
Question
7
7.
Given the mean of
12
samples as
5
5
6
,
what is the new mean if two samples
2
and
9
are removed ?
(i)
59
10
(ii)
49
8
(iii)
23
4
(iv)
61
10
(v)
57
10
Question
8
8.
Find the mean of all prime numbers between 40 and 60.
(i)
243
5
(ii)
241
5
(iii)
49
(iv)
339
7
Question
9
9.
Find the mean of all prime numbers between 10 and 60.
(i)
359
11
(ii)
425
13
(iii)
487
15
(iv)
423
13
(v)
421
13
Question
10
10.
Find the mean of first 9 multiples of 17.
(i)
85
(ii)
84
(iii)
83
(iv)
86
(v)
87
Question
11
11.
Find the mean of first 6 whole numbers.
(i)
3
2
(ii)
3
(iii)
5
2
(iv)
7
2
(v)
9
4
Question
12
12.
Find the mean of first 8 multiples of 17.
(i)
77
(ii)
153
2
(iii)
155
2
(iv)
151
2
(v)
305
4
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
17
(iii)
12
(iv)
15
(v)
16
Question
14
14.
Find the mean of the first 10 even numbers.
(i)
11
(ii)
9
(iii)
14
(iv)
12
(v)
10
Question
15
15.
The marks obtained by 13 students in a test are given below. Find their mean marks.
45
19
6
49
40
4
35
19
24
2
46
9
18
(i)
268
11
(ii)
316
13
(iii)
364
15
(iv)
318
13
(v)
314
13
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 6.
26
26
12
7
8
20
30
40
44
3
(i)
192
7
(ii)
28
(iii)
138
5
(iv)
136
5
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 1.
34
25
11
21
4
50
49
26
40
5
33
11
(i)
101
4
(ii)
99
4
(iii)
49
2
(iv)
51
2
(v)
97
4
Question
18
18.
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 doubled.
4
2
13
3
47
42
36
19
13
50
36
42
25
11
(i)
50
(ii)
49
(iii)
48
(iv)
52
(v)
46
Question
19
19.
Heights of 10 students (in cm) are given below. Find the mean height.
172
162
134
139
156
127
172
168
167
172
(i)
1579
10
cm
(ii)
1571
10
cm
(iii)
157
cm
(iv)
1589
10
cm
(v)
1569
10
cm
Question
20
20.
Heights of 15 plants (in cm) are given below. Find the mean height.
97
64
53
69
97
91
69
68
92
91
65
65
99
72
99
(i)
397
5
cm
(ii)
402
5
cm
(iii)
399
5
cm
(iv)
398
5
cm
(v)
407
5
cm
Question
21
21.
Ages of 15 students (in years) are given below. Find the mean age.
11
13
12
14
11
15
14
15
10
11
14
11
10
10
15
(i)
62
5
years
(ii)
63
5
years
(iii)
64
5
years
(iv)
67
5
years
(v)
72
5
years
Question
22
22.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
5
12
14
5
8
13
11
7
5
15
(i)
10
mm
(ii)
19
2
mm
(iii)
21
2
mm
(iv)
23
2
mm
Question
23
23.
Temperatures of 15 days (in °C) are given below. Find the mean temperature.
35
25
33
33
31
32
27
26
31
32
29
30
34
27
31
(i)
153
5
°C
(ii)
152
5
°C
(iii)
162
5
°C
(iv)
157
5
°C
(v)
154
5
°C
Question
24
24.
Weights of 14 students (in kg) are given below. Find the mean weight.
54
48
47
55
42
53
57
51
43
50
59
54
60
46
(i)
733
14
kg
(ii)
360
7
kg
(iii)
747
14
kg
(iv)
103
2
kg
(v)
719
14
kg
Question
25
25.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
343
408
364
380
307
363
356
422
429
432
327
320
474
402
400
(i)
₹
382.20
(ii)
₹
382.00
(iii)
₹
382.80
(iv)
₹
381.80
(v)
₹
383.80
Question
26
26.
If the mean of
7
samples is
24
4
7
,
what is the new mean if
4
is added to each number.
(i)
200
7
(ii)
202
7
(iii)
198
7
(iv)
144
5
(v)
256
9
Question
27
27.
If the mean of
6
samples is
32
1
3
,
what is the new mean if
8
is subtracted from each number.
(i)
73
3
(ii)
71
3
(iii)
25
(iv)
121
5
Question
28
28.
If the mean of
8
samples is
33
,
what is the new mean if each number is multiplied by
10
.
(i)
331
(ii)
327
(iii)
330
(iv)
329
(v)
333
Question
29
29.
The mean of
10
numbers is
9
3
5
.
Upon
adding
one number,
the mean becomes
8
9
11
.
Find the
included
number.
(i)
-2
(ii)
3
(iii)
0
(iv)
1
(v)
2
Question
30
30.
Scores of 11 students are given below. Find the mean score.
90
76
76
83
87
81
76
85
76
85
83
(i)
900
11
(ii)
898
11
(iii)
909
11
(iv)
920
11
(v)
899
11
Question
31
31.
The mean of
10
numbers is
12
1
10
.
Upon
excluding
one number,
the mean becomes
12
8
9
.
Find the
excluded
number.
(i)
3
(ii)
6
(iii)
5
(iv)
7
(v)
4
Assignment Key
1) (iii)
2) (i)
3) (v)
4) (i)
5) (iii)
6) (i)
7) (i)
8) (i)
9) (iv)
10) (i)
11) (iii)
12) (ii)
13) (iv)
14) (i)
15) (ii)
16) (iii)
17) (ii)
18) (ii)
19) (v)
20) (i)
21) (i)
22) (ii)
23) (ii)
24) (v)
25) (iv)
26) (i)
27) (i)
28) (iii)
29) (iv)
30) (ii)
31) (iii)
