Question

The class marks of a distribution are 15, 20, 25, …., 45. The class corresponding to 25 is *

Answer 1

Answer:

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.

Answer 2

The answer is 22.5
…………….