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  • 24-09-2018
  • Mathematics
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what number must be added to 15, -6, and 12 to have a mean of 5?

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TPS00
TPS00 TPS00
  • 24-09-2018
Let the number to be added is x

The numbers are: 15, -6, 12 and x

Sum = 15+(-6)+12+x = 21+x

Total numbers = 4

[tex]mean = \frac{sum}{total \: numbers} \\ \\ 5 = \frac{21 + x}{4} \\ \\ 5 \times 4 = 21 + x \\ \\ 20 = 21 + x \\ \\ x = 20 - 21 \\ \\ x = \boxed{ - 1}[/tex]

Number to be added is -1.
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