The average height of 18 boys is 170 cm. if the heights of 15 new boys are added, the new average increases by 3 cm. what is the average height of the 15 new boys?
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Answered by
1
the average height of 18 boys is 170 cm
total height will be 18x170=3060cm
15 boys added
now total boys=15+18=33
33boys total height=33×(170+3)
=5709cm avg
now
avg height of 15 boys will be
=(5709-3060)÷15
=2649÷15
=176.6 cm
total height will be 18x170=3060cm
15 boys added
now total boys=15+18=33
33boys total height=33×(170+3)
=5709cm avg
now
avg height of 15 boys will be
=(5709-3060)÷15
=2649÷15
=176.6 cm
Answered by
0
the answer is 176.6 cm
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