EduSahara™ Worksheet

Question 1

1.

(i)

129
8
(ii)

161
10
(iii)

63
4
(iv)

159
10
(v)

157
10

Question 2

2.

If the mean of
7
samples is
30

1
7
,

what is the new mean if
10
is subtracted from each number.

(i)

143
7
(ii)

141
7
(iii)

139
7
(iv)

101
5
(v)

181
9

Question 3

3.

The arithmetic mean of
44

11

24

1

34

3

20

41
is

(i)

23.25
(ii)

22.25
(iii)

24.25
(iv)

20.25
(v)

21.25

Question 4

4.

If the mean of
7
samples is
23

2
7
,

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

(i)

137
5
(ii)

191
7
(iii)

27
(iv)

245
9
(v)

193
7

Question 5

5.

Temperatures of 25 days are given below. Find the mean.

Temperature (in degree C)

25

26

27

29

30

31

32

33

34

35

No. of days

3

3

4

2

1

4

3

2

2

1

(i)

763
25

°C
(ii)

739
25

°C
(iii)

148
5

°C
(iv)

738
25

°C
(v)

788
25

°C

Question 6

6.

If the mean of
6
samples is
24

5
6
,

what is the new mean if each number is multiplied by
10
.

(i)

1241
5
(ii)

249
(iii)

743
3
(iv)

745
3

Question 7

7.

Find the mean of first 8 whole numbers.

(i)

5
2
(ii)

13
4
(iii)

4
(iv)

9
2
(v)

7
2

Question 8

8.

Find the mean of the first 20 odd numbers.

(i)

17
(ii)

21
(iii)

20
(iv)

19
(v)

22

Question 9

9.

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

(i)

731
11
(ii)

199
3
(iii)

863
13
(iv)

865
13
(v)

861
13

Question 10

10.

Given the mean of
10
samples as
6

1
5
,

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

(i)

35
6
(ii)

13
2
(iii)

25
4
(iv)

37
6
(v)

49
8

Question 11

11.

Find the mean of the first 10 even numbers.

(i)

10
(ii)

14
(iii)

8
(iv)

12
(v)

11

Question 12

12.

The arithmetic mean of
20

39

38

46

7

45

7
is

(i)

29.86
(ii)

27.86
(iii)

30.86
(iv)

28.86
(v)

26.86

Question 13

13.

(i)

77
8
(ii)

75
8
(iii)

93
10
(iv)

19
2
(v)

73
8

Question 14

14.

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

Temperature (in degree C)

25

26

27

29

31

34

35

No. of days

1

2

4

5

3

1

4

(i)

599
20

°C
(ii)

299
10

°C
(iii)

637
20

°C
(iv)

597
20

°C
(v)

617
20

°C

Question 15

15.

If the mean of
7
samples is
18
,

what is the new mean if each number is multiplied by
10
.

(i)

180
(ii)

178
(iii)

179
(iv)

182
(v)

181

Question 16

16.

(i)

3
(ii)

4
(iii)

7
(iv)

2
(v)

5

Question 17

17.

(i)

10
(ii)

11
(iii)

8
(iv)

12
(v)

13

Question 18

18.

Given the mean of
10
samples as
5

7
10
,

what is the new mean if two samples
1
and
8
are added ?

(i)

11
2
(ii)

9
2
(iii)

13
2
(iv)

6
(v)

21
4

Question 19

19.

Find the mean of first 9 multiples of 2.

(i)

9
(ii)

12
(iii)

10
(iv)

11
(v)

7

Question 20

20.

If the mean of
6
samples is
27

1
3
,

what is the new mean if
8
is subtracted from each number.

(i)

56
3
(ii)

58
3
(iii)

20
(iv)

96
5

Question 21

21.

Find the mean of all prime numbers between 50 and 60.

(i)

57
(ii)

56
(iii)

58
(iv)

54
(v)

55

Question 22

22.

Find the mean of all prime numbers between 30 and 90.

(i)

535
9
(ii)

299
5
(iii)

415
7
(iv)

419
7
(v)

417
7

Question 23

23.

Find the mean of first 10 whole numbers.

(i)

9
2
(ii)

5
(iii)

11
2
(iv)

17
4
(v)

7
2

Question 24

24.

Given the mean of
12
samples as
7

1
4
,

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

(i)

69
10
(ii)

71
10
(iii)

57
8
(iv)

27
4
(v)

67
10

Question 25

25.

Find the mean of first 8 multiples of 16.

(i)

73
(ii)

72
(iii)

75
(iv)

71
(v)

69

Assignment Key