If there is a 0.3% chance of something happening one day, what is the possibility of it happening throughout twenty days?

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Mathematics

3 March, 08:12

If there is a 0.3% chance of something happening one day, what is the possibility of it happening throughout twenty days?

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Answers (2)

Know the Answer?

Matthew Owens · Answer 1

Matthew Owens 3 March, 08:19

0

Try by multiplying 0.3x20

Ciara Cardenas · Answer 2

You mean of it happening within 20 days?

Well if there is a 3/10 probability of it happening in any given day, there is a 7/10 probability of it not happening on any given day. The probability of it not happening at all in 20 consecutive days is:

(7/10) ^20

So the probability of it happening at least once in 20 days is:

1 - (7/10) ^20≈9992/10000 (about 99.92%)