Question

6. The mean of 1, 3, x and 8 is 7. Find the value of x​

Answer 1

Here The numbers are 1 , 3 , x , 8

Mean = 7

We know that mean = Sum of all observation / Number of observation

7 = 1+3+x+8 / 4

7*4 = 12+x

28 - 12 = x

16 = x

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Answer 2

Answer:

Given

Mean of 1,3,x and 8 is 7

To find

Value of x

Solution

According to the question and formula of mean

Mean = Total sum of observations ÷ No of observations

7 = 1 + 3 + x + 8 ÷ 4

7 × 4 = 12 + x

28 = 12 + x

28-12 = x

16 = x

or x = 16

Therefore the value of x is 16.

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