EduSahara™ Worksheet

Question 1

1.

Find the mean of first 5 multiples of 20.

(i)

60
(ii)

61
(iii)

57
(iv)

59
(v)

63

Question 2

2.

Temperatures of 10 days (in °C) are given below. Find the mean temperature.

32

29

32

31

25

35

35

25

25

26

(i)

61
2

°C
(ii)

59
2

°C
(iii)

63
2

°C
(iv)

30

°C

Question 3

3.

The histogram given below represents the marks obtained by some candidates in an examination. Using the data in the diagram, calculate the mean marks

(i)

55
(ii)

54
(iii)

57
(iv)

56
(v)

58

Question 4

4.

The histogram given below represents the weights of students of a particular class. Using the data in the diagram, calculate the mean weight

(i)

48.69 kg
(ii)

44.69 kg
(iii)

46.69 kg
(iv)

47.69 kg
(v)

45.69 kg

Question 5

5.

If the sum of the following frequency distribution is
21
,

find the value of 'x'.

Class-Interval

Frequency

20 - 25

3

26 - 31

2

32 - 37

9

38 - 43

4

44 - 49

x

(i)

0
(ii)

3
(iii)

5
(iv)

2
(v)

4

Question 6

6.

Given the mean of
10
samples as
6

3
5
,

what is the new mean if two samples
4
and
9
are added ?

(i)

13
2
(ii)

27
4
(iii)

67
10
(iv)

77
12
(v)

79
12

Question 7

7.

The scores obtained by 11 students in a test are given below. Find the mean score.
2

7

1

11

4

18

19

19

1

5

9

(i)

1
(ii)

7
(iii)

8

8
11
(iv)

18
(v)

19

Question 8

8.

The histogram given below is a study of heart patients of different age groups. Using the data in the diagram, calculate the mean age

(i)

56.44 years
(ii)

53.44 years
(iii)

55.44 years
(iv)

54.44 years
(v)

57.44 years

Question 9

9.

If the mean of the following frequency distribution is
7

5
9
,

find the value of 'x'.

Value

Frequency

4

2

5

6

6

1

7

4

8

x

9

3

10

7

11

1

(i)

2
(ii)

4
(iii)

1
(iv)

6
(v)

3

Question 10

10.

The histogram given below shows the number of illiterate persons of different age groups in a town. Using the data in the diagram, calculate the mean age

(i)

28.50 years
(ii)

30.50 years
(iii)

31.50 years
(iv)

29.50 years
(v)

27.50 years

Question 11

11.

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

Age (in years)

10

11

12

13

14

15

No. of students

4

4

4

1

5

2

(i)

51
4

years
(ii)

25
2

years
(iii)

53
4

years
(iv)

49
4

years
(v)

57
4

years

Question 12

12.

Heights of 12 students (in cm) are given below. Find the mean height.

172

133

170

151

138

129

136

131

139

152

130

163

(i)

442
3

cm
(ii)

436
3

cm
(iii)

439
3

cm
(iv)

146

cm
(v)

437
3

cm

Question 13

13.

If the mean of the following frequency distribution is
26

10
31
,

find the value of 'x'.

Class-Interval

Frequency

10 - 16

8

17 - 23

9

24 - 30

x

31 - 37

7

38 - 44

3

45 - 51

3

(i)

1
(ii)

2
(iii)

3
(iv)

-2
(v)

0

Question 14

14.

Scores of 30 students are given below. Find the mean.

Score

70

72

73

80

81

83

85

86

89

No. of students

5

1

5

4

7

1

3

1

3

(i)

79
(ii)

485
6
(iii)

479
6
(iv)

475
6
(v)

473
6

Question 15

15.

Rainfall of 199 days (in mm) are given below. Calculate the mean rainfall from the given histogram.

(i)

53.87 mm
(ii)

51.87 mm
(iii)

48.87 mm
(iv)

45.87 mm
(v)

43.87 mm

Question 16

16.

The marks obtained by 14 students in a test are given below. Find their mean marks.

48

15

25

17

47

39

43

38

40

3

49

22

11

43

(i)

220
7
(ii)

94
3
(iii)

158
5
(iv)

218
7
(v)

222
7

Question 17

17.

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

344

377

342

456

357

435

340

434

464

322

(i)

₹

388.10
(ii)

₹

387.30
(iii)

₹

389.10
(iv)

₹

387.10
(v)

₹

387.20

Question 18

18.

If the mean of
5
samples is
16
,

what is the new mean if
4
is added to each number.

(i)

19
(ii)

20
(iii)

23
(iv)

21
(v)

17

Question 19

19.

Find the mean of the first 20 even numbers.

(i)

24
(ii)

18
(iii)

20
(iv)

21
(v)

22

Question 20

20.

A frequency distribution table is given below.
Find the
mean .

Class-Interval

1 - 6

6 - 11

11 - 16

16 - 21

21 - 26

26 - 31

31 - 36

Frequency

3

41

45

5

29

25

48

(i)

4063
196
(ii)

4257
196
(iii)

4453
196
(iv)

2031
98
(v)

4061
196

Question 21

21.

Find the mean of all prime numbers between 30 and 60.

(i)

133
3
(ii)

313
7
(iii)

311
7
(iv)

309
7
(v)

223
5

Question 22

22.

Heights of 10 students are given below. Find the mean.

Height (in cm)

132

144

151

162

No. of students

2

3

1

4

(i)

150

cm
(ii)

301
2

cm
(iii)

299
2

cm
(iv)

303
2

cm

Question 23

23.

Temperatures of 156 days (in °C) are given below. Calculate the mean temperature from the given histogram.

(i)

57.35 °C
(ii)

52.35 °C
(iii)

55.35 °C
(iv)

49.35 °C
(v)

47.35 °C

Question 24

24.

Wages of 10 labourers are given below. Find the mean.

Wage (in rupees)

319

370

388

417

446

453

476

No. of labourers

1

2

1

1

1

2

2

(i)

₹

417.00
(ii)

₹

417.80
(iii)

₹

418.80
(iv)

₹

416.80
(v)

₹

417.20

Question 25

25.

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

Weight (in kg)

41

42

43

44

46

47

56

57

59

No. of students

2

2

3

1

3

2

3

3

1

(i)

97
2

kg
(ii)

989
20

kg
(iii)

1009
20

kg
(iv)

971
20

kg
(v)

969
20

kg

Assignment Key