Question

After measuring the heights of 7 people, they have an average height of 156cm. after

measuring the heights of 8 people they have an average height of 158cm. how tall is
the 8th person?

Answer 1

8th Person = 172 cm tall

Explanation:

( a + b + c + d + e + f + g )/7 = 156

a + b + c + d + e + f + g = 1092 total size

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now they measured 8 people (a + b... g) + h, but we know the total size of the other 7 = 1092

a + b + c + d + e + f + g + h

( 1092 + h )/8 = 158

1092 + h = 158*8

h = 1264 - 1092

h = 172

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the 8th person is 172 cm tall