Question

The mean height of five friends is 169 cm. The heights of the first four are 162, 178, 170, 161. What is the height of the fifth one? Round your answer to nearest whole number

Answer 1

Answer:

174

Step-by-step explanation:

let the height of fifth one be x

ATQ

162 + 178 + 170 + 161 + x/5 = 169

671 + x/5 = 169

671 + x = 169 × 5

671 + x = 845

x = 845 - 671

x = 174

Answer 2

Answer:

174 cm

Step-by-step explanation:

Let the $5^{th}$ student's height be $x$

formula of mean → $\frac{Sum of ob.}{No. of ob.}$

According to the question,

$\frac{162cm+178cm+170cm+161cm+x}{5} = 169$

= $\frac{671cm+x}{5} = 169$

⇒ $x =$ (169 × 5) - 1671

⇒ $x =$ 845 - 671

⇒ $x =$ 174

∵174 cm

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