Question

1.    If the mean of 9, 8, 10, x, 12 is 15, find the value of x.​

Answer 1

Step-by-step explanation:

Question :-

If the mean of 9, 8, 10, x, 12 is 15, find the value of x.

Solution :-

Mean of the given numbers = (9 + 8 + 10 + x + 12)/5 = (39 + x)/5

According to the problem, mean = 15 (given).

Therefore, (39 + x)/5 = 15

⇒ 39 + x = 15 × 5

⇒ 39 + x = 75

⇒ 39 - 39 + x = 75 - 39

⇒ x = 36

Hence, x = 36

Answer 2

Answer:

x=36

Step-by-step explanation:

mean of the given number=9+8+10+x+12/5=39+x/5

(5 is used because there are 5 numbers in the question)

according to the problem, mean =15

therefore

39+x/5=15

39+x=15×5

39+x=75

39-39+x=75-39. (-39 is added to both the sides)

x=36

Hope this helped

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