Question

Please help will mark brainliest!! 15 POINTS!!

Answer 1

Answer:

decrease

Step-by-step explanation:

If 89 is the highest score, Ken would need a score of 90+ to increase the mean.

$Md < 89\\Mi >89$

Md = mean decreases

Mi = mean increases

Hope this helped!

Answer 2

Find the mean of the first four test scores first.
(Add all numbers in set and divide by how many numbers there are)
81 + 87 + 71 + 89 = 328 / 4 = 82

Then, find the mean with the 85 added as the fifth term.
81 + 87 + 71 + 89 + 85 = 413 / 5 = 82.6

The impact that the 85 had on the mean test score was that the mean/average increased by 0.6.