Question

The mean of 10.,12,13,x,17,18is15.find the value of x​

Answer 1

Answer:

The mean of the given observation is 15

let Y be the mean

therefore,Y=15

all observations =10,12,13,x,17,18

Step-by-step explanation:

Y=(10+12+13+x+17+18)÷6

15=(70+x)÷6

(15×6)=70+x

90-70=x

20=x

therefore

the value of x in the given observation is 20

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Answer 2

Given ,

The given data is :

➡ 10 , 12 , 13 , x , 17 , 18

Mean = 15

We know that ,

$\large \bold{ \sf \fbox{ \fbox{Mean = \frac{Sum \: of \: all \: observation }{Total \: number \: of \: observation} </p><p> }}}$

Substitute the values , we obtain

$\sf \implies 15 = \frac{10 + 12 + 13 + x + 17 + 18}{6} \\ \\ \sf \implies 9 0 = 70 + x \\ \\ \sf \implies x = 20$

Hence , the required value of x is 20