Q37 of 37 Page 14

The mean of the following distribution is 18. Find the frequency f of class 19 – 21.


OR


The following distribution gives the daily income of 50 workers of a factory


[CBSE 2018]


Mean



According to question,

Mean = 18

Cross-multiplying, we get,

⇒ 704 + 20f = 720 + 18f

⇒ 2f = 16

⇒ f = 16/2

⇒ f = 8


OR




Plotting the above points on graph, we get,


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33

The table below shows the daily expenditure on food of 30 households in a locality:


Daily expenditure (in Rs.)

Number of households

100 - 150

6

150 - 200

7

200 - 250

12

250 - 300

3

300 - 350

2

Find the mean and median daily expenditure on food. [CBSE 2009C]

 34

Find the mode, median and mean for the following data: [CBSE 2009]


Marks obtained

25 - 35

35 - 45

45 - 55

55 - 65

65 - 75

75 - 85

Number of students

7

31

33

17

11

1
35

Find the mean, mode and median of the following frequency distribution: [CBSE 2010]


Class interval

0 - 10

10 - 20

20 - 30

30 - 40

40 - 50

50 - 60

60 - 70

Number of batsmen

4

4

7

10

12

8

5
36

Find the mean, median and mode of the following data: [CBSE 2013]


Class

0 - 50

50 - 100

100 - 150

150 - 200

200 - 250

250 - 300

300 - 350

Frequency

2

3

5

6

5

3

1