What is the cumulative frequency after the first two classes?

What is the cumulative frequency after the first two classes?

• A. 1
• B. 5
• C. 6
• D. 7

Answer: (B)

Cumulative frequency is a running total of how many observations fall up to a certain point in the distribution. To get the value after the first two classes, you add the frequencies of those two classes. In this distribution, that sum comes out to five, so the cumulative frequency after the first two classes is five. For example, if the first class had 2 observations and the second had 3, their total would be five, which illustrates the same idea. The other numbers would require different sums of the first two class frequencies, which doesn’t match this data.

Cumulative frequency is a running total of how many observations fall up to a certain point in the distribution. To get the value after the first two classes, you add the frequencies of those two classes. In this distribution, that sum comes out to five, so the cumulative frequency after the first two classes is five. For example, if the first class had 2 observations and the second had 3, their total would be five, which illustrates the same idea. The other numbers would require different sums of the first two class frequencies, which doesn’t match this data.