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Answer

(a) the average distance for all the 10 girls jumped 

= ( 159 + 135 + 160 + 155 + 165 + 150 + 148 + 138 + 156 + 144)/10

=151 cm

(b) The total distance all the 10 boys jumped

= average distance * number of boys

= 178.4 * 10

= 1784 cm

(c)

Average distance for all the pupils = (151 * 10 + 1784)/20 = 164.7 cm

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