Question

The class mark of a particular class is 7 and class size is 10, then the class interval can be:​

Answer 1

Step-by-step explanation:

Class size= Upper Class Limit-Lower Class Limit

Class Mark= 1/2(Upper Class Limit + Lower limit)

Let Upper limit be X and lower limit be Y. Then,

BTP

X - Y = 10

X = 10+ Y----------------(i)

1/2(X+Y) = 7

X+Y= 14

X= 14-Y-----------------(ii)

From (I) and (ii),

10+Y=14-Y

2Y=4

Y=2

and, X= 10+2= 12

Hence, class interval = 2 to 12