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.

Scores of 25 students are given below. Find the mean.

Score

72

73

74

77

78

82

87

No. of students

3

1

5

3

4

4

5

(i)

79
(ii)

393
5
(iii)

394
5
(iv)

398
5
(v)

403
5

Question 2

2.

Find the median of all the factors of 20.

(i)

11
2
(ii)

5
(iii)

9
2
(iv)

17
4
(v)

7
2

Question 3

3.

Temperatures of 15 days are given below. Find the median.

Temperature (in degree C)

26

27

28

29

31

32

33

35

No. of days

2

1

1

1

3

4

1

2

(i)

33

°C
(ii)

29

°C
(iii)

31

°C
(iv)

32

°C
(v)

30

°C

Question 4

4.

Heights of 15 plants are given below. Find the median.

Height (in cm)

52

56

73

74

77

100

No. of plants

3

1

1

5

3

2

(i)

75

cm
(ii)

74

cm
(iii)

72

cm
(iv)

73

cm
(v)

76

cm

Question 5

5.

(i)

2
(ii)

1
(iii)

3
(iv)

5
(v)

4

Question 6

6.

Ages of 13 students (in years) are given below. Find the mean age.

12

15

10

10

12

12

11

15

12

15

15

13

10

(i)

188
13

years
(ii)

164
13

years
(iii)

163
13

years
(iv)

175
13

years
(v)

162
13

years

Question 7

7.

Wages of 25 labourers are given below. Find the median.

Wage (in rupees)

354

378

382

386

420

448

455

471

No. of labourers

3

4

5

1

2

3

3

4

(i)

₹

387.00
(ii)

₹

388.00
(iii)

₹

386.00
(iv)

₹

385.00
(v)

₹

384.00

Question 8

8.

If the mean of
5
samples is
26

4
5
,

what is the new mean if
4
is subtracted from each number.

(i)

158
7
(ii)

116
5
(iii)

70
3
(iv)

114
5
(v)

112
5

Question 9

9.

Weights of 15 students (in kg) are given below. Find the mean weight.

58

58

50

45

59

44

51

44

55

47

53

53

47

42

41

(i)

50

kg
(ii)

259
5

kg
(iii)

254
5

kg
(iv)

251
5

kg
(v)

249
5

kg

Question 10

10.

The scores obtained by 8 students in a test are given below. Find the median.
7

13

11

8

20

3

1

2

(i)

1
(ii)

19
(iii)

7

1
2
(iv)

20
(v)

8

1
8

Question 11

11.

Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.

308

321

315

419

464

453

414

412

366

409

413

359

462

365

300

(i)

₹

386.33
(ii)

₹

386.00
(iii)

₹

387.33
(iv)

₹

385.33
(v)

₹

385.67

Question 12

12.

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.

42

50

20

19

50

35

17

5

35

40

(i)

63
(ii)

313
5
(iii)

311
5
(iv)

437
7

Question 13

13.

Ages of 20 students are given below. Find the median.

Age (in years)

10

11

12

13

14

15

No. of students

2

4

1

7

5

1

(i)

14

years
(ii)

15

years
(iii)

12

years
(iv)

11

years
(v)

13

years

Question 14

14.

Temperatures of 11 days (in °C) are given below. Find the median temperature.

33

32

26

34

34

28

27

34

28

30

27

(i)

31

°C
(ii)

29

°C
(iii)

30

°C
(iv)

28

°C
(v)

32

°C

Question 15

15.

The marks obtained by 13 students in a test are given below. Find their mean marks.

4

47

10

29

22

14

46

50

8

2

43

13

18

(i)

306
13
(ii)

304
13
(iii)

352
15
(iv)

260
11
(v)

308
13

Question 16

16.

Find the mean of the first 15 odd numbers.

(i)

14
(ii)

18
(iii)

16
(iv)

13
(v)

15

Question 17

17.

Find the mean of all prime numbers between 10 and 60.

(i)

425
13
(ii)

487
15
(iii)

359
11
(iv)

421
13
(v)

423
13

Question 18

18.

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 1.

26

44

12

5

15

9

32

5

18

43

2

2

41

44

16

(i)

261
13
(ii)

299
15
(iii)

99
5
(iv)

301
15
(v)

337
17

Question 19

19.

If the sum of the following frequency distribution is
35
,

find the value of 'x'.

Value

Frequency

3

6

4

x

5

3

6

2

7

9

8

1

9

3

10

5

11

1

(i)

4
(ii)

3
(iii)

7
(iv)

6
(v)

5

Question 20

20.

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

Temperature (in degree C)

25

26

27

30

32

33

34

35

No. of days

1

2

2

1

6

4

2

2

(i)

125
4

°C
(ii)

663
20

°C
(iii)

643
20

°C
(iv)

156
5

°C
(v)

623
20

°C

Question 21

21.

Heights of 20 students are given below. Find the mean.

Height (in cm)

130

137

138

141

144

151

155

162

163

169

No. of students

1

1

1

3

3

2

1

2

1

5

(i)

3089
20

cm
(ii)

3051
20

cm
(iii)

305
2

cm
(iv)

3069
20

cm
(v)

3049
20

cm

Question 22

22.

If the mean of the following frequency distribution is
5

15
23
,

find the value of 'x'.

Value

Frequency

1

1

2

4

3

3

4

2

5

3

6

4

8

1

9

1

10

1

12

1

13

x

(i)

4
(ii)

2
(iii)

3
(iv)

1
(v)

0

Question 23

23.

Scores of 11 students are given below. Find the mean score.

75

76

90

73

70

74

83

70

90

81

86

(i)

890
11
(ii)

79
(iii)

879
11
(iv)

870
11
(v)

868
11

Question 24

24.

Weights of 20 students are given below. Find the median.

Weight (in kg)

40

42

45

47

48

52

54

58

No. of students

2

1

1

2

2

5

4

3

(i)

50

kg
(ii)

52

kg
(iii)

53

kg
(iv)

51

kg
(v)

54

kg

Question 25

25.

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

Rainfall (in mm)

5

7

8

9

10

13

14

No. of days

2

1

2

1

2

1

1

(i)

9

mm
(ii)

17
2

mm
(iii)

19
2

mm
(iv)

21
2

mm

Assignment Key