Hillary has the following scores on her math tests: 65, 86, 95, 78. How much would her mean change if the lowest test score is dropped? (round to the nearest whole number)

5 points

4 points

3 points

2 points

Question

Hillary has the following scores on her math tests: 65, 86, 95, 78. How much would her mean change if the lowest test score is dropped? (round to the nearest whole number)

5 points

4 points

3 points

2 points

anonymous · Answer

Th mean of the four scores is$$(65+86+95+78)\div4=324\div4=81$$By dropping the low score the average of the highest three is $$(324-65)\div3=259/3=86.333$$Thus the mean would change 86.333-81=5.333; to the nearest integer, 5 points.