Question

A knee doctor took a survey of the ages of her patients when they needed knee surgery.

The results are given in this data set.

{42, 25, 33, 30, 36, 18, 40}

What number can be removed from the data set so that the median will remain the same?

Responses:

18

30

33

40

Answer 1

33

Explanation:

{42, 25, 33, 30, 36, 18, 40}

The median is the middle number (in order).

{18, 25, 30, 33, 36, 40, 42}

The median is 33.

If we remove 33 then:

{18, 25, 30, 36, 40, 42}

The median would be 33 (the middle number between 30 and 36 is 33).

So, The median still would be 33.