EduSahara™ Worksheet

Question 1

1.

The scores obtained by 12 students in a test are given below. Find the mean score.
4

10

7

1

7

3

3

11

2

20

18

17

(i)

8

7
12
(ii)

20
(iii)

3
(iv)

19
(v)

1

Question 2

2.

(i)

6
(ii)

4
(iii)

5
(iv)

7
(v)

3

Question 3

3.

(i)

83
6
(ii)

57
4
(iii)

29
2
(iv)

85
6
(v)

113
8

Question 4

4.

(i)

65
7
(ii)

85
9
(iii)

9
(iv)

101
11
(v)

83
9

Question 5

5.

Given the mean of
10
samples as
5

7
10
,

what is the new mean if two samples
8
and
3
are added ?

(i)

27
5
(ii)

7
(iii)

17
3
(iv)

5
(v)

19
3

Question 6

6.

Given the mean of
12
samples as
6

1
12
,

what is the new mean if two samples
1
and
9
are removed ?

(i)

13
2
(ii)

51
8
(iii)

61
10
(iv)

63
10
(v)

25
4

Question 7

7.

Find the mean of all prime numbers between 40 and 90.

(i)

383
6
(ii)

127
2
(iii)

385
6
(iv)

257
4
(v)

509
8

Question 8

8.

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

(i)

929
15
(ii)

931
15
(iii)

807
13
(iv)

311
5
(v)

1055
17

Question 9

9.

Find the mean of first 6 multiples of 12.

(i)

44
(ii)

42
(iii)

43
(iv)

41
(v)

40

Question 10

10.

Find the mean of first 6 whole numbers.

(i)

7
2
(ii)

3
(iii)

9
4
(iv)

5
2
(v)

3
2

Question 11

11.

Find the mean of first 7 multiples of 13.

(i)

54
(ii)

53
(iii)

52
(iv)

49
(v)

51

Question 12

12.

Find the mean of the first 15 odd numbers.

(i)

15
(ii)

13
(iii)

18
(iv)

16
(v)

14

Question 13

13.

Find the mean of the first 10 even numbers.

(i)

8
(ii)

10
(iii)

11
(iv)

12
(v)

14

Question 14

14.

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

6

11

36

19

17

44

7

19

49

49

32

17

(i)

49
2
(ii)

101
4
(iii)

51
2
(iv)

26
(v)

53
2

Question 15

15.

The marks obtained by 13 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 8.

23

7

15

46

36

14

11

34

15

35

48

24

8

(i)

418
13
(ii)

420
13
(iii)

356
11
(iv)

484
15
(v)

422
13

Question 16

16.

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 8.

8

33

31

34

21

10

22

21

49

20

33

42

32

27

5

(i)

302
17
(ii)

18
(iii)

266
15
(iv)

268
15

Question 17

17.

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 doubled.

25

21

43

48

38

1

29

1

10

16

44

28

29

49

(i)

382
7
(ii)

380
7
(iii)

490
9
(iv)

274
5
(v)

384
7

Question 18

18.

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

163

161

140

155

164

147

155

144

156

142

140

151

(i)

303
2

cm
(ii)

152

cm
(iii)

305
2

cm
(iv)

307
2

cm

Question 19

19.

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

91

90

77

59

72

95

67

63

53

76

88

81

76

57

(i)

1059
14

cm
(ii)

523
7

cm
(iii)

1047
14

cm
(iv)

1045
14

cm
(v)

1073
14

cm

Question 20

20.

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

10

11

14

14

13

14

10

11

15

12

(i)

72
5

years
(ii)

64
5

years
(iii)

67
5

years
(iv)

63
5

years
(v)

62
5

years

Question 21

21.

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

9

5

6

12

5

15

7

10

8

8

(i)

17
2

mm
(ii)

19
2

mm
(iii)

21
2

mm
(iv)

9

mm

Question 22

22.

Scores of 14 students are given below. Find the mean score.

88

75

75

79

77

76

78

75

77

77

85

72

76

81

(i)

1093
14
(ii)

1105
14
(iii)

1091
14
(iv)

1119
14
(v)

78

Question 23

23.

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

30

27

26

27

32

26

30

25

34

34

(i)

301
10

°C
(ii)

311
10

°C
(iii)

146
5

°C
(iv)

291
10

°C
(v)

293
10

°C

Question 24

24.

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

57

55

57

55

47

40

57

54

42

42

46

46

(i)

301
6

kg
(ii)

305
6

kg
(iii)

311
6

kg
(iv)

50

kg
(v)

299
6

kg

Question 25

25.

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

416

365

461

475

338

385

439

499

418

494

(i)

₹

429.00
(ii)

₹

431.00
(iii)

₹

427.00
(iv)

₹

430.00
(v)

₹

428.00

Question 26

26.

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

(i)

a + 2
(ii)

3a
(iii)

a - 2
(iv)

a

Question 27

27.

The arithmetic mean of
7

15

30

28

49

29

6

11
is

(i)

20.88
(ii)

19.88
(iii)

21.88
(iv)

23.88
(v)

22.88

Question 28

28.

If the mean of
7
samples is
22

5
7
,

what is the new mean if
8
is added to each number.

(i)

213
7
(ii)

275
9
(iii)

31
(iv)

215
7

Question 29

29.

If the mean of
4
samples is
23

3
4
,

what is the new mean if
9
is subtracted from each number.

(i)

57
4
(ii)

59
4
(iii)

29
2
(iv)

31
2
(v)

61
4

Question 30

30.

If the mean of
4
samples is
29

1
4
,

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

(i)

353
4
(ii)

351
4
(iii)

177
2
(iv)

175
2
(v)

349
4

Question 31

31.

(i)

20
(ii)

21
(iii)

17
(iv)

19
(v)

18

Question 32

32.

(i)

10
(ii)

8
(iii)

12
(iv)

9
(v)

7

Question 33

33.

The mean of the below random sample is
27

1
2
.
Find the missing quantity.
19

42

37

33

11

x

40

25

12

24

(i)

32
(ii)

31
(iii)

35
(iv)

29
(v)

33

Assignment Key