Question

23 girls have a mean height of 123cm.17 boys have a mean height of 165cm.Work out the value of all 40

Answer 1

mean of girls height =123cm

so sum of 23 girls height=23×123

=2829

mean of boys height =165cm

so sum of 17 boys height=17×165=2805

so the mean of 40 students=

2805+2829/40

=5634/40

=140.85cm

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