Q7 of 37 Page 14

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]

In a ‘less than type’ cumulative frequency distribution, upper limit of the classes are considered.

It is given by,



AGE(in years)

CUMULATIVE FREQUENCY(Cf)

Less than 20

60

Less than 30

102

Less than 40

157

Less than 50

227

Less than 60

280

Less than 70

300

More from this chapter

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5

If the mean of 25 observations is 27 and each observation is decreased by 7, what will be the new mean?[CBSE 2014]

 6

A data has 25 observations arranged in a descending order. Which observation represents the median?[CBSE 2014]

 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
9

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.