Question

Denzal's first 3 scores in math were 90,100,90.

a.what must Denzal score on his fourth test to keep his mean score at 90 or higher?
b.what must Denzal score on his fourth test to keep his median test score at 90 or higher?

Answer 1

Mean = Σx/n

90 ≤ (90+100+90+x)/4

Solve for x.

Since median is 50%, any score below 90 will have median of 90. Then 90 will be both median and mode.