Willie W. answered • 04/10/15

The Master Math Tutor

P[accounting] = 1 - 0.25 = 0.75

P[math AND accounting] = 0.45

so P[math OR accounting]

= P[math] + P[accounting] - P[math AND accounting]

= 0.65 + 0.75 - 0.45 = 0.85

ans: 0.95 or 95 %

Katie C.

asked • 04/10/15involving a student's attendance at math and accounting classes on Mondays. Assume that the student attends math class with probability 0.65, skips accounting class with probability 0.25, and attends both with probability 0.45.

What is the probability that the student attends at least one class on Monday?

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Willie W. answered • 04/10/15

The Master Math Tutor

P[accounting] = 1 - 0.25 = 0.75

P[math AND accounting] = 0.45

so P[math OR accounting]

= P[math] + P[accounting] - P[math AND accounting]

= 0.65 + 0.75 - 0.45 = 0.85

ans: 0.95 or 95 %

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