Question

the mean of five numbers 3,7,9,12,and x is 8.Find the value of x.

Answer 1

Answer:

x=9

Step-by-step explanation:

Given:-

Mean = 8

other terms = 3,7,9,12,x

To find:- x

Solution:-

We know that

Mean= Sum of all terms/ Total terms....

Here, total terms =5

So, ATQ:-

(3+7+9+12+x)/5 = 8 {Mean}

31+x=8×5

31+x=40

x=9.

CHECK:-

We know that mean =8

So, sum of all terms/total number of terms =8

(3+7+9+12+9)/5=8 {here we put x=9 in last term}

40/5 = 8

8=8

Hence verified....

So , in this mean ,.... the value of x is 9....

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Thanks....

Answer 2

Answer:

x = 9

Step-by-step explanation:

Mean = Sum of all numbers/Total no. of numbers

Numbers = 3, 7, 9, 12, x

Mean = 8

3 + 7 + 9 + 12 + x/5 = 8

31 + x/5 = 8

31 + x = 8 × 5

31 + x = 40

x = 40 - 31

x = 9

Check ⇒

3 + 7 + 9 + 12 + x/5 = 8

x = 9

3 + 7 + 9 + 12 + 9/5 = 8

40/5 = 8

8 = 8

L.H.S = R.H.S

Hence,verified.

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