EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Mean and Median of Ungrouped Data
Grade : ICSE Grade IX
License : Non Commercial Use
Question
1
1.
Scores of 30 students are given below. Find the median.
Score
70
71
72
73
81
82
84
No. of students
4
1
4
9
3
4
5
(i)
74
(ii)
75
(iii)
72
(iv)
73
(v)
71
Question
2
2.
Find the mean of the first 15 even numbers.
(i)
17
(ii)
18
(iii)
15
(iv)
16
(v)
14
Question
3
3.
If the mean of
1
4
x
9
3
is
3
4
5
,
find the value of x.
(i)
2
(ii)
3
(iii)
1
(iv)
0
(v)
5
Question
4
4.
Heights of 20 students are given below. Find the mean.
Height (in cm)
136
146
154
162
169
170
171
172
174
No. of students
4
1
3
2
4
1
2
1
2
(i)
797
5
cm
(ii)
801
5
cm
(iii)
806
5
cm
(iv)
796
5
cm
(v)
798
5
cm
Question
5
5.
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.
19
25
25
4
3
3
50
15
18
9
(i)
169
5
(ii)
239
7
(iii)
173
5
(iv)
171
5
(v)
103
3
Question
6
6.
The scores obtained by 13 students in a test are given below. Find the median.
5
7
20
3
9
17
10
15
9
8
4
4
18
(i)
4
(ii)
9
12
13
(iii)
20
(iv)
3
(v)
9
Question
7
7.
Scores of 13 students are given below. Find the mean score.
71
72
78
71
74
77
74
75
81
87
72
87
72
(i)
1004
13
(ii)
993
13
(iii)
992
13
(iv)
1017
13
(v)
991
13
Question
8
8.
Rainfall of 30 days are given below. Find the median.
Rainfall (in mm)
5
6
7
8
9
10
11
12
13
14
15
No. of days
2
3
3
5
3
3
2
1
1
5
2
(i)
10
mm
(ii)
7
mm
(iii)
11
mm
(iv)
8
mm
(v)
9
mm
Question
9
9.
Heights of 10 plants are given below. Find the mean.
Height (in cm)
55
81
84
88
89
91
No. of plants
1
2
1
2
1
3
(i)
859
10
cm
(ii)
84
cm
(iii)
849
10
cm
(iv)
841
10
cm
(v)
839
10
cm
Question
10
10.
Find the median of all prime numbers between 10 and 60.
(i)
30
(ii)
34
(iii)
31
(iv)
32
(v)
28
Question
11
11.
Heights of 10 plants (in cm) are given below. Find the median height.
73
84
81
71
84
78
89
55
57
70
(i)
76
cm
(ii)
155
2
cm
(iii)
151
2
cm
(iv)
153
2
cm
Question
12
12.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
33
35
No. of days
5
2
4
1
2
3
2
4
3
4
(i)
91
3
°C
(ii)
95
3
°C
(iii)
30
°C
(iv)
89
3
°C
(v)
92
3
°C
Question
13
13.
Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.
407
492
499
496
300
440
383
416
497
396
372
459
500
331
(i)
₹
427.71
(ii)
₹
428.71
(iii)
₹
427.86
(iv)
₹
428.00
(v)
₹
429.71
Question
14
14.
Wages of 30 labourers are given below. Find the median.
Wage (in rupees)
304
323
332
358
421
445
457
461
467
No. of labourers
7
3
4
4
5
3
1
2
1
(i)
₹
358.00
(ii)
₹
357.00
(iii)
₹
359.00
(iv)
₹
360.00
(v)
₹
356.00
Question
15
15.
Scores of 25 students are given below. Find the mean.
Score
75
76
78
82
83
84
86
88
89
90
No. of students
1
3
3
3
1
4
3
1
3
3
(i)
417
5
(ii)
422
5
(iii)
418
5
(iv)
427
5
(v)
419
5
Question
16
16.
Given the mean of
10
samples as
5
4
5
,
what is the new mean if two samples
5
and
5
are added ?
(i)
27
5
(ii)
19
3
(iii)
7
(iv)
5
(v)
17
3
Question
17
17.
Ages of 15 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
5
5
2
1
1
1
(i)
59
5
years
(ii)
57
5
years
(iii)
62
5
years
(iv)
58
5
years
(v)
67
5
years
Question
18
18.
The mean of
7
numbers is
9
5
7
.
Upon
excluding
one number,
the mean becomes
9
1
3
.
Find the
excluded
number.
(i)
13
(ii)
9
(iii)
12
(iv)
11
(v)
15
Question
19
19.
Heights of 14 students (in cm) are given below. Find the mean height.
164
161
162
147
128
126
141
146
172
146
159
148
159
169
(i)
153
cm
(ii)
152
cm
(iii)
150
cm
(iv)
151
cm
(v)
154
cm
Question
20
20.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
337
409
414
422
431
432
472
474
491
No. of labourers
2
3
5
2
2
3
4
1
3
(i)
₹
433.32
(ii)
₹
434.32
(iii)
₹
432.32
(iv)
₹
432.40
(v)
₹
432.36
Question
21
21.
Scores of 13 students are given below. Find the median score.
72
72
80
79
90
74
76
74
74
79
89
70
84
(i)
78
(ii)
76
(iii)
77
(iv)
74
(v)
75
Question
22
22.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
6
7
7
6
9
11
14
11
15
13
6
14
8
12
8
(i)
59
5
mm
(ii)
54
5
mm
(iii)
10
mm
(iv)
49
5
mm
(v)
51
5
mm
Question
23
23.
Heights of 14 students (in cm) are given below. Find the median height.
132
130
142
135
151
132
137
174
129
170
160
150
129
160
(i)
281
2
cm
(ii)
140
cm
(iii)
283
2
cm
(iv)
279
2
cm
Question
24
24.
Find the median of the first 10 odd numbers.
(i)
11
(ii)
9
(iii)
13
(iv)
10
(v)
8
Question
25
25.
Given the mean of
12
samples as
5
7
12
,
what is the new mean if two samples
6
and
7
are removed ?
(i)
37
7
(ii)
27
5
(iii)
17
3
(iv)
5
(v)
29
5
Assignment Key
1) (iv)
2) (iv)
3) (i)
4) (iv)
5) (iv)
6) (v)
7) (v)
8) (v)
9) (v)
10) (iii)
11) (iii)
12) (iv)
13) (i)
14) (i)
15) (i)
16) (v)
17) (ii)
18) (iii)
19) (ii)
20) (iii)
21) (ii)
22) (iv)
23) (iv)
24) (iv)
25) (ii)
