Question

Rosie had 10 boxes of drawing pins.

She counted the number of drawing pins in each box.

The table gives information about her results.


Work out the mean number of drawing pins in a box.

Answer 1

30.2

Explanation:

You want the mean number of drawing pins in a box, given the distribution shown in the table.

Weighted mean

The mean number is the sum of products of the number and its frequency, divided by the total of the frequency numbers.

29·2 +30·5 +31·2 +32·1 = 302

mean = 302/(2+5+2+1) = 30.2

The mean number of drawing pins in a box is 30.2.

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