A histogram is drawn for grouped data. A bar has a class width of 5 and a frequency density of 4. What is the frequency of that class?

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Question

A histogram is drawn for grouped data. A bar has a class width of 5 and a frequency density of 4. What is the frequency of that class?

Accepted Answer

Frequency = 20 — Frequency density = frequency ÷ class width, so frequency = frequency density × class width = 4 × 5 = 20. Option A results from dividing instead of multiplying (5 ÷ 4 would give a different result; 4 ÷ 5 = 0.8). Option B adds class width and frequency density incorrectly. Option C inverts the formula: 5 ÷ 4 = 1.25.

Answer

Frequency = 1.25

Answer

Frequency = 9

Answer

Frequency = 20

Answer

Frequency = 0.8

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