Question

Mary's test grades were 80, 92, 83, 83, and 85. Mary's teacher recorded two of her grades incorrectly. Instead of an 80, Mary's first test score should have been a 74. Instead of a 92, Mary's second test score should have been a 98. Which measure(s) of central tendency are affected by this change?

mean

median

mode

none

Answer 1

A

Answer 2

wrong

Answer 3

B

Answer 4

saying the answer is useless. Try working them out @Muzzack

Answer 5

wrong

Answer 6

since the highest and lowest each changed the same direction, the median (the central number) didn't change

since the most common number, 83 (the mode) didn't change, the mode stays the same

to find the mean, you have to average the scores.

the original scores:
80+92+83+83+85=423 so the average = 84.6

the correct scores:
72+98+83+83+85=423 so the average =84.6

Nothing changed...

Answer 7

Thanks guys c: