Question

if the airthemetic mean of 6, 8, 5, 7, x and 4 is 7 , then x is​

Answer 1

Answer:

12

Step-by-step explanation:

Mean = [Sum of all observations] ÷ [Total number of observations]

7 = [6+8+5+7+x+4] ÷ [6]

42 = 30+x

x = 42 - 30

x = 12    ←ANSWER  

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Answer 2

Answer:

mean =

$\frac{sum \: of \: observation}{total \: observation} \\ 7 = \frac{6 + 8 + 5 + 7 + x + 4}{6} \\ 7 = \frac{30 + x}{6} \\ 7 = 5 + \frac{x}{6} \\ 7 - 5 = \frac{x}{6} \\ 2 \times 6 = x \\ x = 12$

therefore, x = 12