In a frequency distribution, the first class interval begins at 18.The midpoint of the first class interval is 19.5, and the last class interval ends at 51.How many class intervals are there?
A)11
B)17
C)22
D)33
E)34

Question

Quizplus · Accepted Answer

The class width can be determined by doubling the difference between the midpoint and the beginning of the first class interval: 2 * (19.5 - 18) = 3. The range of the distribution is from 18 to 51, which is 33 units. Dividing this range by the class width (33 / 3) gives 11 class intervals.

In a Frequency Distribution, the First Class Interval Begins at 18.The