Question

look at this dictionary entry.
median \mee-dee-uhn\\ noun medians 1. the middle number in a given sequence of numbers: to determine the median, first put the numbers in value order. 2. a line connecting one vertex of a triangle to the midpoint of the opposite side: the three medians of a triangle intersect at a point called the centroid. 3. a grassy or paved area that divides a highway: fortunately, the out-of-control car stopped before it crossed the median. — from latin (medianus)
which sentence uses the word median correctly?
to calculate the median, eddie added all twenty numbers together and divided by twenty.
medians between opposing traffic lanes make wide streets safer for pedestrians to cross.
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Explanation:

The first sentence describes calculating the mean (adding numbers and dividing by count), not the median (middle number in ordered sequence). The second sentence uses "medians" to refer to highway dividers, matching the dictionary's 3rd definition of a median as an area dividing a highway. Thus, the second sentence uses "median" correctly.

Answer:

Medians between opposing traffic lanes make wide streets safer for pedestrians to cross.