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Multiple choice

If the mean of $x,x+2,x+4,x+6$ and $x+8$ is $1$, what is the average of the last three numbers?

  1. 3

  2. 1

  3. 4

  4. 5

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The mean of x, x+2, x+4, x+6, x+8 is (5x + 20) / 5 = x + 4. Given x + 4 = 1, so x = -3. The last three numbers are x+4, x+6, x+8, which are 1, 3, 5. Their average is (1+3+5)/3 = 3.

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