Quantative Literature

Question

The probability that it will rain on any given day is 15% or 0.15. Find the probability it will rain at least once in the next three days.

Answer 1

It would be 1 - the probability it will not rain at all. The probability it will not rain any day is 1 - 0.15 = 0.85. The probability it will not rain at all the next three days is 0.85 * 0.85 * 0.85 = 0.614 So the probability it will rain at least once is 1 - 0.614 = 0.386.