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3 years ago

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

1 answer:

7 0

Answer: " x = 9 " .
____________________________________
Explanation:
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To calculate the mean:
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The mean =

     {the sum of all the values in the number set} ÷

     {the number of values in the data set} ;
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To solve for "x" ;
____________________________________
Given that the "mean" is: "8" ;
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           8  = { 3 + 7 + 9 + 12 + x } / 5 ;
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    ↔ { 3 + 7 + 9 + 12 + x } / 5   = 8 ;
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            → { 3 + 7 + 9 + 12 + x } = 8 * 5 ;
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            → { 31 + x } = 40 ;
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            ↔   x + 31 = 40 ;
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       Subtract "31" from EACH SIDE of the equation; to isolate "x" on one side of the equation; and to solve for "x" ;
____________________________________
            →   x + 31 − 31 = 40 − 31 ;

                       →  x = 9 .
____________________________________

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2 years ago

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Answer:

5 cents

Step-by-step explanation:

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