Question

Assuming the trend that exists in the data set below applies to all students, how long should Tina study if she want to get at least a 90% on the test?

Time Spent Studying (minutes)
Grade on Test (%)
0
28
0
54
30
45
30
39
30
63
60
53
60
75
90
85
90
78
120
92
120
100
120
98
120
89
180
99
180
95
A.
at least 30 minutes
B.
at least 60 minutes
C.
at least 90 minutes
D.
at least 120 minutes

Answer 1

D. at least 120 minutes.

Reason: In the data, the only students who scored 90% or higher studied 120 or 180 minutes. The smallest study time that produced a ≥90% score is 120 minutes, so Tina should study at least 120 minutes.