The scatterplot below shows the relationship between study time and quiz grades.
which of the following statements is best supported by the graphed data?
★ if a student studies less than 15 minutes, his/her grade will be below 85
★ if a student studies more than 5 minutes, his/her grade will be below 70
★ to make a 70 or higher, a student must study at least 4 minutes
★ if a student studies more than 20 minutes, his/her grade will be greater than or equal to 90