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Answered

12.5,−10,−7.5,x; The mean is 11.5.

Answer :

Answer:

x = 51

Step-by-step explanation:

the mean is calculated as

mean = [tex]\frac{sum}{count}[/tex]

here mean = 11.5 , then

[tex]\frac{12.5-10-7.5 +x}{4}[/tex] = 11.5 ( multiply both sides by 4 to clear the fraction )

- 5 + x = 46 ( add 5 to both sides )

x = 51

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