Subject On-Time Assignment Submission On-Time Arrival to Class Physics 89.7% 82.3% Math 88.2% 88.7% Chemistry 89.4% 83.1% Biology 90.1% 82.4% Total 88.5% 84.7% The probabilities by subject of on-time assignment submission and on-time arrival to class are given in the table. What is the chance that the subject is physics if an assignment is submitted on time? A. 82.3% B. 88.5% C. 89.7% D. insufficient data
"if an assignment is submitted on time" so it is already given that the assignment is submitted on time. therefore, the denominator of your probability should be the total % of assignments submitted on time "chance that the subject is physics" so you want the % of assignments that are physics *and* submitted on time, then divide by the total % of assignments submitted on time
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