Question

The mean of 4, 9, 10 and x is 8. Find x

Answer 1

Answer:

Mean= sum of worth(value) of given items /number of items

so (4+9+10+x)/4=8

So 23+x=32

x=9

Answer 2

x = 9

Explanation -:

Mean = 8

Number of observation = 4

Given observations = 4,9,10 and x

$\large\pmb{Mean = \frac{ Sum \: of \: given \: observation }{Number \: of \: observation}}$

$\large\bf{ \frac{4 + 9 + 10 + x}{4} = 8}$

$⇝ \small\rm{23 + x = 8 \times 4}$

$⇝ \small\rm{23 + x = 32}$

$⇝ \small\rm{x = 32 - 23}$

$⇝ \small\rm{x = 9}$