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.
5
6
9
2
16
2
12
7
10
14
5
10
4
17
(i)
8
(ii)
2
(iii)
8
1
2
(iv)
15
(v)
17
Question
2
2.
If the mean of
1
8
5
x
10
4
is
6
1
6
,
find the value of x.
(i)
10
(ii)
12
(iii)
9
(iv)
8
(v)
7
Question
3
3.
The mean of the below random sample is
28
3
10
.
Find the missing quantity.
28
27
42
24
42
23
x
24
24
13
(i)
38
(ii)
36
(iii)
33
(iv)
37
(v)
35
Question
4
4.
Given the mean of
7
samples as
12
5
7
,
what is the mean if a sample value is
increased
by
16
?
(i)
13
(ii)
16
(iii)
17
(iv)
14
(v)
15
Question
5
5.
Given the mean of
12
samples as
9
,
what is the mean if a sample value is
decreased
by
13
?
(i)
97
12
(ii)
109
14
(iii)
95
12
(iv)
81
10
(v)
31
4
Question
6
6.
Given the mean of
10
samples as
5
3
10
,
what is the new mean if two samples
5
and
7
are added ?
(i)
75
14
(ii)
21
4
(iii)
67
12
(iv)
65
12
(v)
11
2
Question
7
7.
Given the mean of
12
samples as
6
1
12
,
what is the new mean if two samples
6
and
8
are removed ?
(i)
57
10
(ii)
59
10
(iii)
23
4
(iv)
61
10
(v)
49
8
Question
8
8.
Find the mean of all prime numbers between 50 and 90.
(i)
635
9
(ii)
775
11
(iii)
211
3
(iv)
637
9
(v)
495
7
Question
9
9.
Find the mean of all prime numbers between 30 and 70.
(i)
49
(ii)
535
11
(iii)
439
9
(iv)
437
9
Question
10
10.
Find the mean of first 8 multiples of 14.
(i)
62
(ii)
60
(iii)
66
(iv)
63
(v)
64
Question
11
11.
Find the mean of first 10 whole numbers.
(i)
7
2
(ii)
9
2
(iii)
5
(iv)
11
2
(v)
17
4
Question
12
12.
Find the mean of first 5 multiples of 15.
(i)
46
(ii)
42
(iii)
45
(iv)
44
(v)
47
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
15
(iii)
12
(iv)
17
(v)
16
Question
14
14.
Find the mean of the first 15 even numbers.
(i)
13
(ii)
15
(iii)
19
(iv)
17
(v)
16
Question
15
15.
The marks obtained by 13 students in a test are given below. Find their mean marks.
9
43
31
46
19
40
41
42
23
35
24
48
18
(i)
419
13
(ii)
355
11
(iii)
161
5
(iv)
421
13
(v)
417
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 1.
27
44
46
30
44
6
42
48
30
4
1
1
30
(i)
28
(ii)
368
13
(iii)
310
11
(iv)
366
13
(v)
422
15
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.
40
5
33
50
23
11
1
22
29
3
46
19
(i)
43
2
(ii)
47
2
(iii)
89
4
(iv)
45
2
(v)
23
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.
34
46
49
14
11
38
31
23
24
23
14
24
14
4
(i)
347
7
(ii)
149
3
(iii)
351
7
(iv)
349
7
(v)
251
5
Question
19
19.
Heights of 10 students (in cm) are given below. Find the mean height.
169
170
155
149
138
162
159
147
127
158
(i)
777
5
cm
(ii)
769
5
cm
(iii)
767
5
cm
(iv)
772
5
cm
(v)
768
5
cm
Question
20
20.
Heights of 13 plants (in cm) are given below. Find the mean height.
56
91
80
83
84
97
98
74
66
83
96
91
76
(i)
1075
13
cm
(ii)
1101
13
cm
(iii)
1088
13
cm
(iv)
1077
13
cm
(v)
1076
13
cm
Question
21
21.
Ages of 11 students (in years) are given below. Find the mean age.
14
15
13
11
15
15
14
13
14
13
14
(i)
152
11
years
(ii)
173
11
years
(iii)
153
11
years
(iv)
151
11
years
(v)
162
11
years
Question
22
22.
Rainfall of 12 days (in mm) are given below. Find the mean rainfall.
11
12
12
9
11
9
5
12
6
14
9
6
(i)
32
3
mm
(ii)
10
mm
(iii)
31
3
mm
(iv)
35
3
mm
(v)
29
3
mm
Question
23
23.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
32
34
32
28
25
32
30
31
35
30
32
34
25
(i)
400
13
°C
(ii)
402
13
°C
(iii)
401
13
°C
(iv)
426
13
°C
(v)
413
13
°C
Question
24
24.
Weights of 14 students (in kg) are given below. Find the mean weight.
58
40
54
49
55
41
53
50
55
50
41
48
51
59
(i)
354
7
kg
(ii)
352
7
kg
(iii)
366
7
kg
(iv)
353
7
kg
(v)
359
7
kg
Question
25
25.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
491
374
347
402
309
432
424
301
448
392
(i)
₹
391.00
(ii)
₹
393.00
(iii)
₹
392.00
(iv)
₹
390.00
(v)
₹
394.00
Question
26
26.
If the mean of
7
samples is
22
4
7
,
what is the new mean if
4
is added to each number.
(i)
188
7
(ii)
186
7
(iii)
134
5
(iv)
184
7
(v)
238
9
Question
27
27.
If the mean of
8
samples is
29
1
8
,
what is the new mean if
5
is subtracted from each number.
(i)
191
8
(ii)
195
8
(iii)
193
8
(iv)
241
10
(v)
145
6
Question
28
28.
If the mean of
6
samples is
23
5
6
,
what is the new mean if each number is multiplied by
8
.
(i)
192
(ii)
952
5
(iii)
572
3
(iv)
574
3
(v)
190
Question
29
29.
The mean of
9
numbers is
9
5
9
.
Upon
adding
one number,
the mean becomes
10
3
10
.
Find the
included
number.
(i)
17
(ii)
14
(iii)
16
(iv)
18
(v)
20
Question
30
30.
Scores of 11 students are given below. Find the mean score.
87
70
70
87
81
80
88
86
78
75
72
(i)
885
11
(ii)
875
11
(iii)
896
11
(iv)
874
11
(v)
876
11
Question
31
31.
The mean of
6
numbers is
10
1
6
.
Upon
excluding
one number,
the mean becomes
9
3
5
.
Find the
excluded
number.
(i)
11
(ii)
12
(iii)
13
(iv)
16
(v)
14
Assignment Key
1) (iii)
2) (iii)
3) (ii)
4) (v)
5) (iii)
6) (iv)
7) (ii)
8) (i)
9) (iii)
10) (iv)
11) (ii)
12) (iii)
13) (ii)
14) (v)
15) (i)
16) (iv)
17) (iv)
18) (iv)
19) (iii)
20) (i)
21) (iv)
22) (v)
23) (i)
24) (ii)
25) (iii)
26) (ii)
27) (iii)
28) (iii)
29) (i)
30) (iv)
31) (iii)
