Q9 of 37 Page 14

The monthly pocket money of 50 students of a class are given in the following distribution: [CBSE 2014]


Monthly pocket money (in Rs.)

0 - 50

50 - 100

100 - 150

150 - 200

200 - 250

250 - 300

Number of students

2

7

8

30

12

1

 Find the modal class and also give class mark of the modal class.

Here, the maximum class frequency is 30.

The class corresponding to this frequency is the modal class. ⇒ modal class = 150 - 200


∴ lower limit of the modal class (l) = 150


The class mark is found by,



∴ Class mark is 175.

More from this chapter

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7

The following are the ages of 300 patients getting medical treatment in a hospital on a particular day:


Age (in years)

10 - 20

20 - 30

30 - 40

40 - 50

50 - 60

60 - 70

Number of patients

60

42

55

70

53

20

Form a 'less than type' cumulative frequency distribution. [CBSE 2013]

 8

In the following data, find the values of p and q. Also, find the median class and modal class. [CBSE 2013]


Class

Frequency (f)

cummulative frequency (cf)

100 - 200

11

11

200 - 300

12

P

300 - 400

10

33

400 - 500

Q

46

500 - 600

20

66

600 - 700

14

80
10

For a certain distribution, mode and median were found to be 1000 and 1250 respectively. Find mean for this distribution using an empirical relation.[CBSE 2014]

 11

Find the mode of the given data: [CBSE 2015]


Class interval

0 - 20

20 - 40

40 - 60

60 - 80

Frequency

15

6

18

10