EduSahara™ Worksheet

EduSahara™ Worksheet

Name : Chapter Based Worksheet

Chapter : Mean and Median of Ungrouped Data

Grade : ICSE Grade IX

License : Non Commercial Use

Question 1

1.

Find the mean of all prime numbers between 30 and 90.

(i)

419
7
(ii)

415
7
(iii)

417
7
(iv)

535
9
(v)

299
5

Question 2

2.

Find the mean of first 9 multiples of 11.

(i)

58
(ii)

54
(iii)

55
(iv)

56
(v)

52

Question 3

3.

The marks obtained by 12 students in a test are given below. Find their mean marks.

46

40

22

48

39

26

47

14

26

15

42

4

(i)

63
2
(ii)

123
4
(iii)

121
4
(iv)

61
2
(v)

125
4

Question 4

4.

Wages of 30 labourers are given below. Find the mean.

Wage (in rupees)

307

342

355

377

379

387

396

407

413

447

448

468

No. of labourers

1

3

3

4

2

2

3

2

5

1

1

3

(i)

₹

393.47
(ii)

₹

393.53
(iii)

₹

395.47
(iv)

₹

393.60
(v)

₹

394.47

Question 5

5.

Daily wages of 10 labourers (in ₹) are given below. Find the median wage.

449

493

495

486

358

400

367

307

339

453

(i)

₹

426.50
(ii)

₹

424.50
(iii)

₹

425.00
(iv)

₹

425.50

Question 6

6.

Given the mean of
10
samples as
5

3
10
,

what is the new mean if two samples
1
and
8
are added ?

(i)

41
8
(ii)

29
6
(iii)

31
6
(iv)

11
2
(v)

21
4

Question 7

7.

Scores of 15 students are given below. Find the median.

Score

73

74

78

80

85

87

89

90

No. of students

2

2

2

2

1

3

1

2

(i)

78
(ii)

82
(iii)

81
(iv)

79
(v)

80

Question 8

8.

Weights of 12 students (in kg) are given below. Find the mean weight.

51

52

47

57

42

49

45

50

46

50

60

54

(i)

205
4

kg
(ii)

203
4

kg
(iii)

201
4

kg
(iv)

209
4

kg
(v)

101
2

kg

Question 9

9.

Rainfall of 10 days are given below. Find the median.

Rainfall (in mm)

6

7

9

11

12

13

No. of days

2

2

1

2

1

2

(i)

11

mm
(ii)

10

mm
(iii)

8

mm
(iv)

12

mm
(v)

9

mm

Question 10

10.

If the mean of
4
samples is
23
,

what is the new mean if
6
is subtracted from each number.

(i)

17
(ii)

19
(iii)

18
(iv)

14
(v)

16

Question 11

11.

Heights of 25 plants are given below. Find the median.

Height (in cm)

53

55

58

63

64

77

82

84

97

No. of plants

4

2

1

2

3

1

3

5

4

(i)

76

cm
(ii)

77

cm
(iii)

75

cm
(iv)

79

cm
(v)

78

cm

Question 12

12.

Heights of 14 students (in cm) are given below. Find the mean height.

164

173

169

146

136

140

169

159

143

138

163

151

143

128

(i)

1075
7

cm
(ii)

1062
7

cm
(iii)

1061
7

cm
(iv)

1068
7

cm
(v)

1063
7

cm

Question 13

13.

Temperatures of 15 days (in °C) are given below. Find the median temperature.

29

28

32

28

32

29

33

26

34

30

30

34

26

29

30

(i)

31

°C
(ii)

29

°C
(iii)

30

°C
(iv)

32

°C
(v)

28

°C

Question 14

14.

Rainfall of 13 days (in mm) are given below. Find the median rainfall.

14

10

13

6

14

6

5

13

5

10

13

7

5

(i)

11

mm
(ii)

12

mm
(iii)

9

mm
(iv)

8

mm
(v)

10

mm

Question 15

15.

Heights of 14 students (in cm) are given below. Find the median height.

128

140

167

156

150

170

139

143

171

153

146

141

162

156

(i)

305
2

cm
(ii)

152

cm
(iii)

307
2

cm
(iv)

303
2

cm

Question 16

16.

Wages of 15 labourers are given below. Find the median.

Wage (in rupees)

322

345

368

379

395

455

462

480

499

No. of labourers

2

1

4

1

1

1

2

2

1

(i)

₹

378.00
(ii)

₹

379.00
(iii)

₹

377.00
(iv)

₹

380.00
(v)

₹

381.00

Question 17

17.

The observations of an ungrouped data are
x

1
,
x

2
,
2x

1
and
x

1
<
x

2
<
2x

1
.

If the mean and median of the data are equal to
12
,

find the observations of the data

(i)
12

,

12

,

20
(ii)
16

,

12

,

32
(iii)
9

,

12

,

18
(iv)
8

,

12

,

16

Question 18

18.

Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.

380

416

301

373

461

350

469

378

465

305

486

(i)

₹

398.73
(ii)

₹

398.64
(iii)

₹

400.55
(iv)

₹

398.55
(v)

₹

399.55

Question 19

19.

(i)

-2
(ii)

0
(iii)

4
(iv)

2
(v)

1

Question 20

20.

If the mean of
8
samples is
17

1
4
,

what is the new mean if each number is multiplied by
10
.

(i)

173
(ii)

343
2
(iii)

347
2
(iv)

689
4
(v)

345
2

Question 21

21.

The mean of the below random sample is
25

7
10
.
Find the missing quantity.
16

16

46

20

10

23

x

14

45

30

(i)

34
(ii)

38
(iii)

37
(iv)

36
(v)

39

Question 22

22.

Temperatures of 25 days are given below. Find the mean.

Temperature (in degree C)

25

27

29

30

33

34

35

No. of days

6

2

2

5

5

4

1

(i)

30

°C
(ii)

748
25

°C
(iii)

749
25

°C
(iv)

773
25

°C
(v)

798
25

°C

Question 23

23.

Rainfall of 13 days (in mm) are given below. Find the mean rainfall.

14

8

8

7

8

10

6

10

11

7

7

8

6

(i)

123
13

mm
(ii)

110
13

mm
(iii)

112
13

mm
(iv)

136
13

mm
(v)

111
13

mm

Question 24

24.

Rainfall of 20 days are given below. Find the mean.

Rainfall (in mm)

5

6

7

9

10

11

12

13

14

15

No. of days

2

3

2

2

1

1

4

2

1

2

(i)

219
20

mm
(ii)

199
20

mm
(iii)

10

mm
(iv)

239
20

mm
(v)

201
20

mm

Question 25

25.

Find the median of the first 20 even numbers.

(i)

19
(ii)

23
(iii)

21
(iv)

22
(v)

20

Assignment Key