Question

The Class Marks of a Frequency Distribution are 15, 20, 25, 30, . . .
The Class corresponding to the Class Mark 20 is

(a) 12.5 - 17.5
(b) 17.5 - 22.5
(c) 18.5 - 21.5
(d) 19.5 - 20.5​

Answer 1

Answer:

Solution

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Correct option is

B

17.5−22.5

Width=5

Class marks=20

∴Lower limit=20−

2

5

⇒

2

40−5

=

2

35

=17.5

Upper limit=20+

2

5

⇒

2

40+5

=

2

45

=22.5

Hence the class corresponding to the class mark 20 is 17.5−22.5.