A factory makes toasters.
Four samples of toasters are tested for faults.
Each sample has size 400
Here are the relative frequencies of faulty toasters in the samples.
P
Q
Relative frequency 0.04
Sample
0.045
R
0.015
S
0.02
Work out the range of the number of faulty toasters in the four samples.
You must show your working.
Your final line should say, Range = .
