Question

Write the class size and class mark of 15and 20?

Answer 1

Solution :

i ) Class size of 15 to 20 = 20 - 15 = 5

ii ) Class mark = average of upper limit

and lower limit

= ( 20 + 15 )/2

= 35/2

= 17.5

••••

Answer 2

(1) Class size = Upper limit - Lower limit = 20 - 15 = 5.

(2) Class mark = Upper limit + Lower limit /2 = 20 + 15/2 = 35/2 = 17.5