Question

the mean height of 11 friend its 155.2 cm is one friend whose height is 158 cm leaves find the new mean height

Answer 1

Total height of 11 friends=11×155.2=1707.2cm

Sum of heights after one friend leaves=1707.2-58=1649.2cm

New mean height=1649.2÷10=164.92cm

Answer 2

The new mean height is 154.92 cm

Step-by-step explanation:

$Average = \frac{\text{Sum of all observations}}{\text{No. of observations}}$

We are given that the mean height of 11 friend its 155.2 cm

So, $155.2 = \frac{\text{Sum of height of 11 friends}}{11}$

$155.2 \times 11 = \text{Sum of height of 11 friends}$

$1707.2= \text{Sum of height of 11 friends}$

We are given that one friend whose height is 158 cm leaves

So, new sum = 1707.2-158=1549.2

No. of friends = 10

So, New mean = $\frac{1549.2}{10}=154.92$

Hence The new mean height is 154.92 cm

#Learn more :

Height (in cm) of 7 boys of a locality are 144 cm, 155 cm, 168 cm, 163 cm, 167 cm, 151 cm and 158 cm. Find their mean height.

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