Question

The median of the set (n, n+5, n+6, n+9, n+15) is 9. What is the mean?

Answer 1

Actually, the answer is 10.

Explanation:

Your solution said:

mean = (3+8+9+12+15) /5

= (47)/5

= 9 2/5

=9.4

When you did your addition, you missed a number:

n, n+5, n+6, n+9, n+15

3, 8, 9, 12, 18

So the answer would be:

mean = (3+8+9+12+18)/5

=(50)/5

= 10

Sorry if that sounded mean.

Answer 2

=9.4

Explanation:

The median is the middle of the numbers when lined up from smallest to largest

(n, n+5, n+6, n+9, n+15)

The median is n+6

n+6 = 9

Subtract 6 from each side

n +6-6 = 9-6

n = 3

The numbers are

(n, n+5, n+6, n+9, n+15)

3, 8 ,9 ,12, 15

The mean is where you add up all the numbers and divide by the number of numbers

mean = (3+8+9+12+15) /5

= (47)/5

= 9 2/5

=9.4