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:
Let the upper limit and lower limit of the class be x, y
Then 
= 42
Or x + y = 84
x - y = 10
Solving equations x = 47, y = 37
6
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:
Let the upper limit and lower limit of the class be x, y
Then = 42
Or x + y = 84
x - y = 10
Solving equations x = 47, y = 37