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

johnweldon1993 · Answer

Well the mean as it is....is 65 + 86 + 95 + 78....and the result of that divided by 4....so 81...

if the lowest score (65) is dropped...we will have

86 + 95 + 78 = 259

but now since there are only 3 test...we divide this number by 3... so 259 / 3 = ?

ttp · Answer

3

johnweldon1993 · Answer

well 259 / 3 = 86.33

so the change from 81 to 86.3 is approximately...?

ttp · Answer

5?

johnweldon1993 · Answer

Yeah 5...did that make sense? you don't seem to sure

ttp · Answer

Yes, that made sense. I just double guess myself lol.

johnweldon1993 · Answer

lol just go with your first instinct! :) but good job!

ttp · Answer

Thanks for helping me! :)

johnweldon1993 · Answer

Anytime! :)