GB-31-03-001 · Mean from a frequency table

The table shows the number of pets owned by some students.

Pets	0	1	2	3	4
Frequency	8	13	5	4	5

Calculate the mean number of pets. Give your answer to 2 decimal places.

Averages: Mean from an Ungrouped Frequency Table Booklet p. 67

Method

1) Use the actual value x for ungrouped data; use a midpoint only for a class interval

2) Multiply each value by its frequency

3) Divide the total fx (or fm) by the total frequency

Worked Example (GB-31-03-001)

\text{Mean}=\frac{\sum fx}{\sum f}=\frac{55}{35}=1.57

Ans = 1.57