EduSahara™ Worksheet

Question 1

1.

The scores obtained by 8 students in a test are given below. Find the mean score.
9

12

10

11

17

3

3

3

(i)

17
(ii)

8

1
2
(iii)

14
(iv)

9

1
2
(v)

3

Question 2

2.

(i)

11
(ii)

9
(iii)

8
(iv)

13
(v)

10

Question 3

3.

(i)

8
(ii)

42
5
(iii)

26
3
(iv)

28
3
(v)

10

Question 4

4.

(i)

65
8
(ii)

79
10
(iii)

81
10
(iv)

77
10
(v)

31
4

Question 5

5.

Given the mean of
10
samples as
4

3
5
,

what is the new mean if two samples
6
and
5
are added ?

(i)

21
4
(ii)

17
4
(iii)

19
4
(iv)

9
2
(v)

11
2

Question 6

6.

Given the mean of
12
samples as
6

1
6
,

what is the new mean if two samples
10
and
1
are removed ?

(i)

13
2
(ii)

25
4
(iii)

51
8
(iv)

61
10
(v)

63
10

Question 7

7.

Find the mean of all prime numbers between 20 and 60.

(i)

201
5
(ii)

41
(iii)

121
3
(iv)

119
3

Question 8

8.

Find the mean of all prime numbers between 30 and 100.

(i)

931
15
(ii)

311
5
(iii)

1055
17
(iv)

929
15
(v)

807
13

Question 9

9.

Find the mean of first 5 multiples of 12.

(i)

36
(ii)

35
(iii)

37
(iv)

38
(v)

34

Question 10

10.

Find the mean of first 7 whole numbers.

(i)

0
(ii)

6
(iii)

3
(iv)

4
(v)

2

Question 11

11.

Find the mean of first 5 multiples of 14.

(i)

44
(ii)

41
(iii)

42
(iv)

40
(v)

43

Question 12

12.

Find the mean of the first 15 odd numbers.

(i)

16
(ii)

15
(iii)

17
(iv)

13
(v)

14

Question 13

13.

Find the mean of the first 10 even numbers.

(i)

9
(ii)

11
(iii)

12
(iv)

13
(v)

10

Question 14

14.

The marks obtained by 11 students in a test are given below. Find their mean marks.

4

31

48

30

44

36

38

7

12

24

28

(i)

302
11
(ii)

356
13
(iii)

300
11
(iv)

248
9
(v)

304
11

Question 15

15.

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 increased by 5.

40

38

13

45

23

10

38

50

31

6

29

15

46

4

(i)

293
9
(ii)

229
7
(iii)

33
(iv)

227
7

Question 16

16.

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 decreased by 7.

29

10

41

40

31

30

6

26

26

16

(i)

39
2
(ii)

73
4
(iii)

35
2
(iv)

37
2
(v)

19

Question 17

17.

The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.

9

10

6

7

42

31

1

35

18

6

19

(i)

370
11
(ii)

366
11
(iii)

434
13
(iv)

302
9
(v)

368
11

Question 18

18.

Heights of 15 students (in cm) are given below. Find the mean height.

146

141

160

135

136

153

142

132

159

148

127

160

168

154

160

(i)

2236
15

cm
(ii)

741
5

cm
(iii)

2221
15

cm
(iv)

2222
15

cm
(v)

2251
15

cm

Question 19

19.

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

78

53

66

81

79

59

83

55

50

76

96

52

69

95

(i)

498
7

cm
(ii)

503
7

cm
(iii)

510
7

cm
(iv)

496
7

cm
(v)

71

cm

Question 20

20.

Ages of 10 students (in years) are given below. Find the mean age.

13

15

10

11

12

15

14

11

10

13

(i)

63
5

years
(ii)

62
5

years
(iii)

64
5

years
(iv)

67
5

years
(v)

72
5

years

Question 21

21.

Rainfall of 14 days (in mm) are given below. Find the mean rainfall.

11

11

12

5

13

7

6

5

12

7

8

8

12

10

(i)

141
14

mm
(ii)

127
14

mm
(iii)

64
7

mm
(iv)

129
14

mm
(v)

155
14

mm

Question 22

22.

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

81

89

75

83

72

76

86

83

81

87

(i)

407
5
(ii)

833
10
(iii)

813
10
(iv)

163
2
(v)

823
10

Question 23

23.

Temperatures of 13 days (in °C) are given below. Find the mean temperature.

25

34

32

25

33

32

32

32

35

34

29

32

35

(i)

436
13

°C
(ii)

423
13

°C
(iii)

410
13

°C
(iv)

411
13

°C
(v)

412
13

°C

Question 24

24.

Weights of 14 students (in kg) are given below. Find the mean weight.

57

56

55

46

57

57

49

40

40

58

44

49

60

57

(i)

727
14

kg
(ii)

739
14

kg
(iii)

753
14

kg
(iv)

363
7

kg
(v)

725
14

kg

Question 25

25.

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

467

375

341

331

436

470

338

377

387

408

331

(i)

₹

387.36
(ii)

₹

387.55
(iii)

₹

387.45
(iv)

₹

388.36
(v)

₹

389.36

Question 26

26.

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

(i)

a
(ii)

a - 2
(iii)

a + 2
(iv)

3a

Question 27

27.

The arithmetic mean of
12

4

5

16

43

43
is

(i)

20.5
(ii)

22.5
(iii)

18.5
(iv)

21.5
(v)

19.5

Question 28

28.

If the mean of
4
samples is
19
,

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

(i)

21
(ii)

23
(iii)

25
(iv)

24
(v)

22

Question 29

29.

If the mean of
5
samples is
22
,

what is the new mean if
5
is subtracted from each number.

(i)

14
(ii)

16
(iii)

18
(iv)

17
(v)

19

Question 30

30.

If the mean of
7
samples is
15

4
7
,

what is the new mean if each number is multiplied by
4
.

(i)

438
7
(ii)

436
7
(iii)

312
5
(iv)

560
9
(v)

62

Question 31

31.

(i)

15
(ii)

14
(iii)

16
(iv)

18
(v)

17

Question 32

32.

(i)

2
(ii)

6
(iii)

4
(iv)

7
(v)

5

Question 33

33.

The mean of the below random sample is
33

9
10
.
Find the missing quantity.
42

38

40

x

48

44

27

26

26

22

(i)

26
(ii)

27
(iii)

23
(iv)

28
(v)

25

Assignment Key