Question

the mean of observation x, 2x+1,2x+5 and 2x+9 is 30.What is the mean of first three observations

Answer 1

Your Answer :-

The mean of x , 2x+1 , 2x+5, 2x+9 is 30.

$\underline{According to Quesion}$

$\frac{x+2x+1+2x+5+2x+9}{4} = 30$

$\frac{7x+15}{4} = 30$

7x + 15 = 120 .

7x = 105

x = 15 .

$\boxed{Then , }$

$\boxed {According to Question}$

x = 15 .

2x + 1 = 31 .

2x +5 = 35 .

$\underline{Mean of First three Observation}$

$\frac{15+31+35}{3}$

$\frac{81}{3}$

⇒27 .

$\boxed{ The mean of First Three Observation is 27}$

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