median
don steward
mathematics teaching 10 ~ 16

Sunday 13 October 2019

average number of siblings

this idea is from Dick Hess' book, 'mental gymnastics', problem number 97

it could be used to introduce finding the mean of a frequency distribution

later problems can involve trial and improvement or factorising quadratic equations

a powerpoint is here





I have chosen to use sets with integer averages

some families are large
reasonably evident without using algebra



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