Question

is the mean of 3, 7, 11 and X is 9 what is the value of x​

Answer 1

3+7+11+x/4=9

21+x=36

x=36-21

x=15

hope it will help you...

Answer 2

Answer:

The value of x is 15

Step-by-step explanation:

$Mean = \frac{\text{Sum of all observations}}{\text{no. of observations}}$

We are given that the mean of 3, 7, 11 and X is 9

So, $9 = \frac{3+7+11+x}{4}$

36=21+x

15=x

Hence The value of x is 15

#Learn more:

Find the average of 12 number if first 8numbers average is 21 find the average of last 4 numbers

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