Question

if the class mark in a frequency distribution of 15 20 25 30 and its corresponding to the class mark 25 is :: (a)12.5-17.5. (b)20.5-29.5. (c)18.5-21.5 (d)22.5-27.5​

Answer 1

Answer:

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.