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p(a) = 0.60, p(b) = 0.20, and p(a and b) = 0.15 what is p(a or b) choices: A. 0.12, B. 0.65, C. 0.40, or D. 0.80 (Note- This is on AP3X)

User Prak
by
5.8k points

2 Answers

2 votes

Answer

0.65

Explanation:

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User Wayne See
by
5.9k points
2 votes

Answer:


P(a\ or\ b) = 0.65

Explanation:

Given

P(a) = 0.60

P(b) = 0.20

P(a and b) = 0.15

Required

Determine P(a or b)

In probability;


P(a\ and\ b) = P(a) + P(b) - P(a\ or\ b)

Substitute values for P(a and b), P(a) and P(b)


0.15 = 0.60 + 0.20 - P(a\ or\ b)

Collect Like Terms


P(a\ or\ b) = 0.60 + 0.20 - 0.15


P(a\ or\ b) = 0.65

Hence, option B answers the question

User Isaac Lubow
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6.0k points