CBSE Class 10-Mathematics: Chapter –14 Statistics Part 11

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Question 2:

Find the median of the following data:

The median of the following data

Marks

Frequency

Less than

Less than

Less than

Less than

Less than

Less than

Less than

Less than

Answer:

First of all, we shall change cumulating series into simple series.

We have

First of all we shall change cumulating series

X

F

C.F

0-10

0

0

10-30

10

10

30-50

15

25

50-70

18

43

70-90

22

65

90-110

22

87

110-130

9

96

130-150

4

100

Now ,

which lies in 70-90 class

Median class

Here,

We know that Median,

Question 3:

Find the median of the following data.

Find the median of the following data

Wages (in rupees)

No. of workers

More than 150

More than 140

More than 130

More than 120

More than 110

More than 100

More than 90

More than 80

Answer:

First of all, we shall find simple frequencies.

First of all we shall find simple frequencies

Wages (in Rupees) (X)

No. of workers (F)

C.F

80-90

9

9

90-100

17

26

100-110

19

45

110-120

45

90

120-130

33

123

130-140

15

138

140-150

2

150

Now which lies in class

Median class

Here,

We know that