Question

if the arithmetic mean of x,x+3,x+6,x+9& x+12is 10 then x=?​

Answer 1

Answer:

Step-by-step explanation:

An=A+(N-1)D

10=X+(4-1)X+3

10=X+(3)X+3

10=X+3X+9

10-9=4X

1=4X

1/4=X

Answer 2

Mean of the observation =

x+(x+3)+(x+6)+(x+9)+(x+12)

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5

So,5x +30

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5

=x+6

A.T.Q

x+6= 10

or, x= 10-- 6

x = 4 .

Hence, the value of x is 4