EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Mean and Median of Ungrouped Data
Grade : ICSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
8
samples is
21
1
4
,
what is the new mean if
10
is subtracted from each number.
(i)
43
4
(ii)
23
2
(iii)
47
4
(iv)
67
6
(v)
45
4
Question
2
2.
If the mean of
5
4
8
3
x
6
7
9
is
5
3
8
,
find the value of x.
(i)
-2
(ii)
1
(iii)
3
(iv)
2
(v)
0
Question
3
3.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
387
436
450
425
366
437
360
464
317
449
433
331
484
380
380
(i)
₹
407.00
(ii)
₹
406.60
(iii)
₹
407.60
(iv)
₹
406.80
(v)
₹
408.60
Question
4
4.
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 increased by 3.
28
39
36
7
5
42
25
18
28
27
27
25
(i)
57
2
(ii)
115
4
(iii)
343
12
(iv)
287
10
(v)
341
12
Question
5
5.
Find the median of all the factors of 40.
(i)
13
2
(ii)
25
4
(iii)
15
2
(iv)
11
2
(v)
7
Question
6
6.
Wages of 30 labourers are given below. Find the mean.
Wage (in rupees)
340
342
359
379
391
416
431
No. of labourers
5
6
5
2
6
3
3
(i)
₹
373.20
(ii)
₹
374.07
(iii)
₹
375.07
(iv)
₹
373.07
(v)
₹
373.13
Question
7
7.
Given the mean of
10
samples as
5
3
10
,
what is the new mean if two samples
8
and
10
are added ?
(i)
23
4
(ii)
61
10
(iii)
71
12
(iv)
73
12
(v)
81
14
Question
8
8.
Heights of 10 students (in cm) are given below. Find the median height.
134
128
169
153
126
172
169
159
151
130
(i)
153
cm
(ii)
151
cm
(iii)
154
cm
(iv)
150
cm
(v)
152
cm
Question
9
9.
Heights of 10 students (in cm) are given below. Find the mean height.
146
153
155
173
127
142
171
139
163
159
(i)
764
5
cm
(ii)
769
5
cm
(iii)
774
5
cm
(iv)
766
5
cm
(v)
153
cm
Question
10
10.
Rainfall of 15 days are given below. Find the mean.
Rainfall (in mm)
5
8
9
10
12
13
14
15
No. of days
1
2
5
1
1
3
1
1
(i)
57
5
mm
(ii)
54
5
mm
(iii)
53
5
mm
(iv)
52
5
mm
(v)
62
5
mm
Question
11
11.
Wages of 15 labourers are given below. Find the median.
Wage (in rupees)
325
362
366
445
452
479
497
No. of labourers
1
2
2
3
3
2
2
(i)
₹
443.00
(ii)
₹
447.00
(iii)
₹
444.00
(iv)
₹
445.00
(v)
₹
446.00
Question
12
12.
The mean of
5
numbers is
8
.
Upon
adding
one number,
the mean becomes
9
1
6
.
Find the
included
number.
(i)
17
(ii)
13
(iii)
15
(iv)
14
(v)
16
Question
13
13.
Find the mean of first 6 multiples of 7.
(i)
47
2
(ii)
49
2
(iii)
25
(iv)
97
4
(v)
51
2
Question
14
14.
The observations of an ungrouped data are
x
1
,
x
2
,
x
3
and
x
1
<
x
2
<
x
3
.
If the mean and median of the data are
48
and
32
respectively and
x
3
-
x
1
=
80
,
find
x
1
,
x
2
,
x
3
(i)
18
,
32
,
98
(ii)
16
,
32
,
96
(iii)
32
,
32
,
192
(iv)
20
,
32
,
100
Question
15
15.
Given the mean of
12
samples as
5
11
12
,
what is the new mean if two samples
2
and
10
are removed ?
(i)
49
8
(ii)
57
10
(iii)
59
10
(iv)
23
4
(v)
61
10
Question
16
16.
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 9.
44
47
28
46
30
28
5
13
30
33
5
22
(i)
75
4
(ii)
223
12
(iii)
221
12
(iv)
187
10
(v)
37
2
Question
17
17.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
43
51
54
55
58
No. of students
3
1
3
1
2
(i)
103
2
kg
(ii)
523
10
kg
(iii)
533
10
kg
(iv)
513
10
kg
(v)
257
5
kg
Question
18
18.
Given the mean of
5
samples as
9
3
5
,
what is the mean if a sample value is
decreased
by
12
?
(i)
36
5
(ii)
34
5
(iii)
22
3
(iv)
50
7
(v)
38
5
Question
19
19.
Ages of 15 students (in years) are given below. Find the mean age.
15
14
12
15
12
12
13
10
12
15
14
15
11
14
12
(i)
211
15
years
(ii)
66
5
years
(iii)
196
15
years
(iv)
226
15
years
(v)
197
15
years
Question
20
20.
Scores of 25 students are given below. Find the mean.
Score
74
77
78
80
81
84
85
87
88
No. of students
1
2
3
3
3
1
3
3
6
(i)
2074
25
(ii)
2073
25
(iii)
2123
25
(iv)
2098
25
(v)
83
Question
21
21.
Find the mean of the first 20 even numbers.
(i)
22
(ii)
18
(iii)
20
(iv)
21
(v)
23
Question
22
22.
Find the mean of all prime numbers between 50 and 80.
(i)
331
5
(ii)
461
7
(iii)
463
7
(iv)
595
9
(v)
465
7
Question
23
23.
Given the mean of
8
samples as
9
1
2
,
what is the mean if a sample value is
increased
by
16
?
(i)
25
2
(ii)
45
4
(iii)
21
2
(iv)
23
2
(v)
12
Question
24
24.
Ages of 30 students are given below. Find the median.
Age (in years)
10
11
12
13
14
15
No. of students
5
2
1
10
7
5
(i)
11
years
(ii)
15
years
(iii)
13
years
(iv)
14
years
(v)
12
years
Question
25
25.
Scores of 25 students are given below. Find the median.
Score
70
75
78
79
80
82
83
88
No. of students
3
4
4
2
4
2
5
1
(i)
81
(ii)
78
(iii)
80
(iv)
77
(v)
79
Assignment Key
1) (v)
2) (ii)
3) (ii)
4) (iii)
5) (i)
6) (iv)
7) (iii)
8) (v)
9) (i)
10) (iv)
11) (iv)
12) (iii)
13) (ii)
14) (ii)
15) (iii)
16) (ii)
17) (iv)
18) (i)
19) (iii)
20) (ii)
21) (iv)
22) (iii)
23) (iv)
24) (iii)
25) (v)
