Pls help

It will be (b) 7

Take first class 40-45 and so on.

Please explain how?

Smallest No. is 44

Largest is 73

Class lenght is given 5

Form classess in such a way that you can make frequency destribution covering from smallest to largest data. 

Class Interval will be:

40-45, 45-50, 50-55, 55-60, 60-65, 65-70 & 70-75

can we do lyk this

44-49

49-54

54-59

59-64

64-69

69-74

Yes, you can.

then the answer can also be 6.

plz send me a file in which summary knowledge of income tax of all head