EduSahara™ Worksheet

Question 1

1.

The scores obtained by 7 students in a test are given below. Find the mean score.
13

6

19

12

10

15

10

(i)

12
(ii)

19
(iii)

13
(iv)

6
(v)

12

1
7

Question 2

2.

(i)

10
(ii)

8
(iii)

11
(iv)

9
(v)

12

Question 3

3.

(i)

25
2
(ii)

53
4
(iii)

77
6
(iv)

79
6
(v)

101
8

Question 4

4.

(i)

100
11
(ii)

82
9
(iii)

98
11
(iv)

102
11
(v)

118
13

Question 5

5.

Given the mean of
10
samples as
3

7
10
,

what is the new mean if two samples
10
and
7
are added ?

(i)

5
(ii)

7
2
(iii)

9
2
(iv)

17
4
(v)

11
2

Question 6

6.

Given the mean of
12
samples as
6

1
2
,

what is the new mean if two samples
5
and
5
are removed ?

(i)

32
5
(ii)

22
3
(iii)

36
5
(iv)

34
5
(v)

46
7

Question 7

7.

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

(i)

423
13
(ii)

487
15
(iii)

421
13
(iv)

359
11
(v)

425
13

Question 8

8.

Find the mean of all prime numbers between 40 and 100.

(i)

863
13
(ii)

865
13
(iii)

199
3
(iv)

731
11
(v)

861
13

Question 9

9.

Find the mean of first 7 multiples of 7.

(i)

27
(ii)

26
(iii)

28
(iv)

30
(v)

29

Question 10

10.

Find the mean of first 10 whole numbers.

(i)

5
(ii)

9
2
(iii)

17
4
(iv)

11
2
(v)

7
2

Question 11

11.

Find the mean of first 7 multiples of 13.

(i)

52
(ii)

51
(iii)

55
(iv)

53
(v)

50

Question 12

12.

Find the mean of the first 10 odd numbers.

(i)

9
(ii)

11
(iii)

12
(iv)

10
(v)

7

Question 13

13.

Find the mean of the first 10 even numbers.

(i)

9
(ii)

12
(iii)

10
(iv)

11
(v)

13

Question 14

14.

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

48

6

29

31

8

31

44

16

25

18

36

8

(i)

27
(ii)

23
(iii)

25
(iv)

24
(v)

26

Question 15

15.

The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 9.

35

35

22

20

32

3

13

43

48

38

11

44

(i)

115
3
(ii)

39
(iii)

37
(iv)

187
5
(v)

113
3

Question 16

16.

The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 8.

17

7

3

5

43

11

32

24

21

10

3

18

30

21

(i)

10
(ii)

17
2
(iii)

19
2
(iv)

21
2
(v)

37
4

Question 17

17.

The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.

36

35

17

37

13

48

19

32

17

44

34

6

(i)

169
3
(ii)

167
3
(iii)

57
(iv)

281
5

Question 18

18.

Heights of 11 students (in cm) are given below. Find the mean height.

169

152

151

172

142

163

142

130

138

133

155

(i)

1647
11

cm
(ii)

1649
11

cm
(iii)

1658
11

cm
(iv)

1669
11

cm
(v)

1648
11

cm

Question 19

19.

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

84

84

94

60

56

77

59

78

66

77

65

80

(i)

226
3

cm
(ii)

221
3

cm
(iii)

220
3

cm
(iv)

74

cm
(v)

223
3

cm

Question 20

20.

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

14

13

15

11

11

12

10

15

15

15

13

14

14

(i)

185
13

years
(ii)

173
13

years
(iii)

174
13

years
(iv)

198
13

years
(v)

172
13

years

Question 21

21.

Rainfall of 10 days (in mm) are given below. Find the mean rainfall.

10

7

15

13

10

9

5

15

10

8

(i)

53
5

mm
(ii)

51
5

mm
(iii)

52
5

mm
(iv)

56
5

mm
(v)

61
5

mm

Question 22

22.

Scores of 10 students are given below. Find the mean score.

72

88

90

82

78

71

79

89

85

77

(i)

811
10
(ii)

821
10
(iii)

813
10
(iv)

831
10
(v)

406
5

Question 23

23.

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

30

30

25

32

34

28

29

29

26

26

(i)

299
10

°C
(ii)

309
10

°C
(iii)

289
10

°C
(iv)

291
10

°C
(v)

29

°C

Question 24

24.

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

48

57

44

46

45

53

46

46

46

57

45

43

(i)

50

kg
(ii)

49

kg
(iii)

48

kg
(iv)

46

kg
(v)

47

kg

Question 25

25.

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

382

484

358

371

390

315

375

349

470

392

476

422

451

381

395

(i)

₹

402.73
(ii)

₹

400.87
(iii)

₹

401.73
(iv)

₹

400.80
(v)

₹

400.73

Question 26

26.

The arithmetic mean of a + 2, a, and a - 2 is

(i)

3a
(ii)

a + 2
(iii)

a
(iv)

a - 2

Question 27

27.

The arithmetic mean of
6

18

21

15

34

22

31
is

(i)

23
(ii)

22
(iii)

19
(iv)

21
(v)

20

Question 28

28.

If the mean of
8
samples is
27

3
4
,

what is the new mean if
9
is added to each number.

(i)

73
2
(ii)

149
4
(iii)

147
4
(iv)

75
2
(v)

145
4

Question 29

29.

If the mean of
8
samples is
21

7
8
,

what is the new mean if
7
is subtracted from each number.

(i)

147
10
(ii)

121
8
(iii)

117
8
(iv)

119
8
(v)

91
6

Question 30

30.

If the mean of
7
samples is
17

5
7
,

what is the new mean if each number is multiplied by
3
.

(i)

374
7
(ii)

478
9
(iii)

370
7
(iv)

372
7
(v)

266
5

Question 31

31.

(i)

9
(ii)

8
(iii)

11
(iv)

10
(v)

13

Question 32

32.

(i)

13
(ii)

11
(iii)

9
(iv)

15
(v)

12

Question 33

33.

The mean of the below random sample is
28

1
10
.
Find the missing quantity.
43

42

34

30

14

x

26

26

25

13

(i)

28
(ii)

29
(iii)

27
(iv)

26
(v)

31

Assignment Key