Question

In the class-intervals 1-10, 11-20, 21-30: the class 11-20 after adjustment is ______.

Options

• 0.5-10.5

• 20.5-30.5

• 10.5-30.5

• 10.5-20.5

Answer 1

In the class-intervals 1-10, 11-20, 21-30: the class 11-20 after adjustment is 10.5-20.5.

Explanation:

To convert discontinuous class intervals into a continuous series, calculate half the difference between consecutive class limits (which is 0.5 in this case) and apply the adjustment. Subtracting 0.5 from the lower limit (11) and adding 0.5 to the upper limit (20) yields the adjusted continuous class of 10.5-20.5.