Respuesta :

Answer:

ORDER THEM FROM LEAST TO GREATEST THEN CROSS OFF A NUMBER FROM EACH SIDE TILL YOU  ARE LEFT WITH ONE IN THE MIDDLE

ANSWER IS 17

Step-by-step explanation:

Median means you have to take the middle of the set of data

Step 1: Put the numbers in order from smallest to largest

12  15  15  15  17  17  18  20  21

Step 2: To find the exact middle each "level" take away the  1st and last number <<<Does that make sense?

12  15  15  15  17  17  18  20 21

     15  15  15  17  17  18  20

          15  15  17  17  18  

                15 17  17

                      17

The median is 17

Hope this helped!

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