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Andru [333]
3 years ago
12

12.5,−10,−7.5,x; The mean is 11.5.

Mathematics
1 answer:
Stella [2.4K]3 years ago
5 0

Answer:

x = 51

Step-by-step explanation:

the mean is calculated as

mean = \frac{sum}{count}

here mean = 11.5 , then

\frac{12.5-10-7.5 +x}{4} = 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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