1 Answer

Egor B Eremeev · Answer 1 · 2020-12-13T10:41:43+0000

Answer: Third Option

$P (M\ or\ N) = 0.8$

Explanation:

In this case, we have two non-disjoint events.

So the probability of M or N occurring is

$P (M\ or\ N) = P(M) + P(N) - P (M\ and\ N)$

We know that in this problem

$P(M) = 0.7\\\\P(N) = 0.5$

$P(M\ and\ N) = 0.4$

So

$P (M\ or\ N) = 0.7 + 0.5 - 0.4$

$P (M\ or\ N) = 0.8$

The answer is the third option

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