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Mathematics 57 Online
Manny0987654:

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

Mercury:

"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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