EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Mean and Median of Ungrouped Data
Grade : ICSE Grade IX
License : Non Commercial Use
Question
1
1.
The mean of
5
numbers is
12
.
Upon
excluding
one number,
the mean becomes
10
1
4
.
Find the
excluded
number.
(i)
21
(ii)
16
(iii)
20
(iv)
18
(v)
19
Question
2
2.
Find the median of all the factors of 30.
(i)
11
2
(ii)
21
4
(iii)
6
(iv)
9
2
(v)
13
2
Question
3
3.
If the mean of
5
samples is
22
3
5
,
what is the new mean if
3
is subtracted from each number.
(i)
98
5
(ii)
20
(iii)
96
5
(iv)
136
7
Question
4
4.
Rainfall of 12 days (in mm) are given below. Find the median rainfall.
13
9
8
5
9
12
14
11
10
11
14
13
(i)
9
mm
(ii)
13
mm
(iii)
12
mm
(iv)
11
mm
(v)
10
mm
Question
5
5.
Heights of 10 students are given below. Find the mean.
Height (in cm)
129
131
148
159
171
174
No. of students
3
1
1
3
1
1
(i)
746
5
cm
(ii)
749
5
cm
(iii)
744
5
cm
(iv)
149
cm
(v)
754
5
cm
Question
6
6.
Wages of 10 labourers are given below. Find the median.
Wage (in rupees)
308
402
411
460
487
494
496
No. of labourers
1
2
3
1
1
1
1
(i)
₹
413.00
(ii)
₹
409.00
(iii)
₹
410.00
(iv)
₹
411.00
(v)
₹
412.00
Question
7
7.
Given the mean of
15
samples as
13
7
15
,
what is the mean if a sample value is
increased
by
19
?
(i)
249
17
(ii)
193
13
(iii)
223
15
(iv)
73
5
(v)
221
15
Question
8
8.
Heights of 15 students are given below. Find the median.
Height (in cm)
145
146
156
167
168
172
173
No. of students
4
2
1
2
1
1
4
(i)
165
cm
(ii)
169
cm
(iii)
166
cm
(iv)
167
cm
(v)
168
cm
Question
9
9.
Find the mean of all prime numbers between 20 and 80.
(i)
50
(ii)
49
(iii)
51
(iv)
53
(v)
52
Question
10
10.
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.
1
50
38
14
25
31
23
38
47
5
(i)
274
5
(ii)
380
7
(iii)
272
5
(iv)
54
(v)
164
3
Question
11
11.
Rainfall of 15 days are given below. Find the mean.
Rainfall (in mm)
5
8
9
10
11
12
13
14
15
No. of days
2
1
1
1
1
2
5
1
1
(i)
196
15
mm
(ii)
181
15
mm
(iii)
167
15
mm
(iv)
56
5
mm
(v)
166
15
mm
Question
12
12.
Heights of 11 plants (in cm) are given below. Find the median height.
95
86
94
57
91
55
88
68
57
97
64
(i)
86
cm
(ii)
85
cm
(iii)
84
cm
(iv)
87
cm
(v)
88
cm
Question
13
13.
Weights of 30 students are given below. Find the mean.
Weight (in kg)
40
43
45
53
55
56
59
No. of students
6
2
2
5
2
6
7
(i)
52
kg
(ii)
154
3
kg
(iii)
155
3
kg
(iv)
157
3
kg
(v)
160
3
kg
Question
14
14.
Find the mean of first 6 multiples of 7.
(i)
25
(ii)
49
2
(iii)
97
4
(iv)
51
2
(v)
47
2
Question
15
15.
Find the median of all prime numbers between 50 and 90.
(i)
70
(ii)
69
(iii)
74
(iv)
72
(v)
71
Question
16
16.
Weights of 13 students (in kg) are given below. Find the mean weight.
60
43
47
58
60
49
44
55
50
41
51
58
48
(i)
665
13
kg
(ii)
690
13
kg
(iii)
677
13
kg
(iv)
664
13
kg
(v)
666
13
kg
Question
17
17.
If the sum of the following frequency distribution is
35
,
find the value of 'x'.
Value
Frequency
6
5
7
x
8
10
9
6
10
4
11
7
(i)
1
(ii)
2
(iii)
5
(iv)
3
(v)
4
Question
18
18.
Scores of 15 students are given below. Find the mean.
Score
72
74
78
85
86
89
No. of students
1
4
2
1
3
4
(i)
408
5
(ii)
1238
15
(iii)
245
3
(iv)
1253
15
(v)
1223
15
Question
19
19.
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 10.
16
8
8
32
5
41
15
7
23
26
20
35
29
24
19
(i)
52
5
(ii)
178
17
(iii)
138
13
(iv)
32
3
(v)
158
15
Question
20
20.
Find the mean of the first 15 odd numbers.
(i)
18
(ii)
14
(iii)
15
(iv)
16
(v)
13
Question
21
21.
Ages of 14 students (in years) are given below. Find the median age.
11
13
11
15
11
13
15
15
12
11
10
15
11
10
(i)
27
2
years
(ii)
25
2
years
(iii)
23
2
years
(iv)
12
years
Question
22
22.
Temperatures of 10 days (in °C) are given below. Find the median temperature.
30
34
35
35
34
30
34
32
27
27
(i)
34
°C
(ii)
33
°C
(iii)
32
°C
(iv)
31
°C
(v)
35
°C
Question
23
23.
Ages of 30 students are given below. Find the median.
Age (in years)
10
11
12
13
14
15
No. of students
7
10
4
3
3
3
(i)
9
years
(ii)
13
years
(iii)
10
years
(iv)
12
years
(v)
11
years
Question
24
24.
Given the mean of
12
samples as
6
,
what is the new mean if two samples
9
and
3
are removed ?
(i)
5
(ii)
7
(iii)
8
(iv)
6
(v)
3
Question
25
25.
The scores obtained by 10 students in a test are given below. Find the median.
11
8
12
9
12
9
1
10
14
17
(i)
16
(ii)
17
(iii)
10
3
10
(iv)
1
(v)
10
1
2
Assignment Key
1) (v)
2) (i)
3) (i)
4) (iv)
5) (iii)
6) (iv)
7) (v)
8) (iv)
9) (iii)
10) (iii)
11) (v)
12) (i)
13) (ii)
14) (ii)
15) (v)
16) (iv)
17) (iv)
18) (v)
19) (v)
20) (iii)
21) (iii)
22) (ii)
23) (v)
24) (iv)
25) (v)
