Question

The mid-value of a class interval is 42. If the class size is 10, then the upper and lower limits of the class are:

A. 47 and 37

B. 37 and 47

C. 37.5 and 47.5

D. 47.5 and 37.5

Answer 1

Let the upper limit and lower limit of the class be x, y

Then \(\frac{(x+y)}{2}\) = 42

Or x + y = 84

x - y = 10

Solving equations x = 47, y = 37