Question

Find x if9,x,14,18x,x,8,10 and 4 have a mean of 11

Answer 1

hye


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we have to Find x if9,x,14,18x,x,8,10 and 4 ,if they have a mean of 11


=>mean = sumof observations/no.of observation

=>$\frac{9+x+14+18x+x+8+10+ 4}{8} =11$

=>$\frac{45+20x}{8} =11$

=>
$8*11 = 45+20x$

=>$88= 45+20x$

=>$20x = 88 -45$

=>$20x = 43$

=>$x = 2.15$

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hope it helps ...........

Answer 2

Answer:

The value of x is 2.15.

Step-by-step explanation:

Given : Series $9,x,14,18x,x,8,10, 4$ and their mean is 11

To find : The value of x

Solution :

To find the mean the formula is sum of all the number divided by total number.

$\text{Mean}= \frac{\text{Sum of numbers}}{\text{Total numbers}}$

Total numbers is 8

$11= \frac{9+x+14+18x+x+8+10+4}{8}$

$11= \frac{45+20x}{8}$

$11\times 8=45+20x$

$88-45=20x$

$20x=43$

$x=\frac{43}{20}$

$x=2.15$

Therefore, The value of x is 2.15.