P10 | Maths Made Easy

P10

QUESTION:60 14-year-old girls are asked for their shoe size. The results are recorded in the table below. Work out the mean shoe size for these 60 girls, rounding your answer to 1dp.

 

ANSWER: To calculate the mean, we must multiply each shoe size by its frequency, add up all of those values, and then divide the result by 60. Doing this, we get

\text{mean }=\dfrac{(1\times2)+(2\times0)+(3\times12)+(4\times22)+(5\times14)+(6\times7)+(7\times3)}{60}= \dfrac{259}{60}=4.3\text{ (1dp)}