EduSahara™ Worksheet

Question 1

1.

The scores obtained by 14 students in a test are given below. Find the mean score.
20

16

1

1

5

15

3

16

8

9

16

18

13

5

(i)

11
(ii)

10

3
7
(iii)

19
(iv)

16
(v)

1

Question 2

2.

(i)

9
(ii)

12
(iii)

8
(iv)

10
(v)

7

Question 3

3.

(i)

91
9
(ii)

29
3
(iii)

89
9
(iv)

107
11
(v)

71
7

Question 4

4.

(i)

45
4
(ii)

85
8
(iii)

65
6
(iv)

67
6
(v)

21
2

Question 5

5.

Given the mean of
10
samples as
6

3
10
,

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

(i)

3
(ii)

9
(iii)

6
(iv)

7
(v)

5

Question 6

6.

Given the mean of
12
samples as
5

7
12
,

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

(i)

57
10
(ii)

11
2
(iii)

47
8
(iv)

67
12
(v)

59
10

Question 7

7.

Find the mean of all prime numbers between 20 and 70.

(i)

489
11
(ii)

579
13
(iii)

403
9
(iv)

493
11
(v)

491
11

Question 8

8.

Find the mean of all prime numbers between 40 and 60.

(i)

243
5
(ii)

49
(iii)

241
5
(iv)

339
7

Question 9

9.

Find the mean of first 7 multiples of 5.

(i)

19
(ii)

18
(iii)

21
(iv)

20
(v)

23

Question 10

10.

Find the mean of first 10 whole numbers.

(i)

9
2
(ii)

11
2
(iii)

17
4
(iv)

7
2
(v)

5

Question 11

11.

Find the mean of first 7 multiples of 3.

(i)

13
(ii)

11
(iii)

15
(iv)

12
(v)

10

Question 12

12.

Find the mean of the first 15 odd numbers.

(i)

15
(ii)

12
(iii)

14
(iv)

16
(v)

17

Question 13

13.

Find the mean of the first 15 even numbers.

(i)

16
(ii)

17
(iii)

19
(iv)

14
(v)

15

Question 14

14.

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

39

37

32

37

12

3

28

28

7

10

47

(i)

230
9
(ii)

330
13
(iii)

278
11
(iv)

280
11
(v)

282
11

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 1.

11

26

5

48

28

13

35

25

7

5

15

9

(i)

241
12
(ii)

239
12
(iii)

201
10
(iv)

277
14
(v)

79
4

Question 16

16.

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 decreased by 1.

37

4

22

9

22

29

5

21

31

46

22

26

(i)

133
6
(ii)

173
8
(iii)

43
2
(iv)

89
4
(v)

131
6

Question 17

17.

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 doubled.

34

35

28

24

20

21

31

2

14

31

(i)

47
(ii)

46
(iii)

48
(iv)

51
(v)

49

Question 18

18.

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

168

149

170

145

149

147

156

128

151

161

128

159

(i)

1823
12

cm
(ii)

151

cm
(iii)

1811
12

cm
(iv)

1813
12

cm
(v)

1835
12

cm

Question 19

19.

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

57

79

52

73

69

70

64

79

64

84

78

67

84

92

(i)

520
7

cm
(ii)

507
7

cm
(iii)

513
7

cm
(iv)

506
7

cm
(v)

508
7

cm

Question 20

20.

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

14

15

13

14

11

15

10

15

15

12

10

14

10

(i)

170
13

years
(ii)

168
13

years
(iii)

194
13

years
(iv)

181
13

years
(v)

13

years

Question 21

21.

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

7

6

7

14

13

14

15

10

7

6

(i)

99
10

mm
(ii)

10

mm
(iii)

101
10

mm
(iv)

109
10

mm
(v)

119
10

mm

Question 22

22.

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

75

78

72

72

80

71

87

79

81

88

82

90

72

79

(i)

80
(ii)

81
(iii)

77
(iv)

79
(v)

78

Question 23

23.

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

28

30

28

29

27

33

32

26

29

28

28

26

27

(i)

384
13

°C
(ii)

371
13

°C
(iii)

373
13

°C
(iv)

372
13

°C
(v)

397
13

°C

Question 24

24.

Weights of 15 students (in kg) are given below. Find the mean weight.

44

46

60

56

40

54

54

45

41

41

53

53

55

42

45

(i)

244
5

kg
(ii)

253
5

kg
(iii)

243
5

kg
(iv)

49

kg
(v)

248
5

kg

Question 25

25.

Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.

304

399

351

390

355

481

335

441

419

427

497

398

402

352

(i)

₹

397.00
(ii)

₹

398.50
(iii)

₹

396.50
(iv)

₹

397.50

Question 26

26.

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

(i)

a + 2
(ii)

3a
(iii)

a
(iv)

a - 2

Question 27

27.

The arithmetic mean of
5

45

1

30

35

36
is

(i)

25.33
(ii)

24.33
(iii)

23.33
(iv)

27.33
(v)

26.33

Question 28

28.

If the mean of
7
samples is
14

6
7
,

what is the new mean if
7
is added to each number.

(i)

153
7
(ii)

155
7
(iii)

151
7
(iv)

111
5
(v)

65
3

Question 29

29.

If the mean of
8
samples is
19

1
4
,

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

(i)

49
4
(ii)

47
4
(iii)

25
2
(iv)

51
4
(v)

73
6

Question 30

30.

If the mean of
7
samples is
20

1
7
,

what is the new mean if each number is multiplied by
7
.

(i)

139
(ii)

143
(iii)

142
(iv)

141
(v)

140

Question 31

31.

(i)

-2
(ii)

1
(iii)

2
(iv)

0
(v)

4

Question 32

32.

(i)

18
(ii)

17
(iii)

20
(iv)

19
(v)

22

Question 33

33.

The mean of the below random sample is
25

9
10
.
Find the missing quantity.
x

32

49

14

12

24

10

34

39

28

(i)

20
(ii)

14
(iii)

17
(iv)

18
(v)

16

Assignment Key