What is the median of the data displayed in this box-and-whisker plot?

84.0

99.5

113.0

143.0

I think that the MEDIAN is 99.5 (b)

the MEAN is 109.875.

Sorry that I couldn't have been of more help.

Take the three sides of a triangle, add them in pairs. Check if the sum is greater than (not equal to) the third side.

If that is true, then it is possible to construct a triangle with the given side lengths.

Let us try the measure of line segments given above.

3 + 5 > 3      3 + 3 > 3   5 + 3 > 3

      8 > 3       6 > 3          8 > 3

You see, each side lengths are greater than the third side length, therefore, you can construct a triangle out of these segment lengths.