sheepmaster sheepmaster
  • 14-07-2017
  • Mathematics
contestada

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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cindyycristanho
cindyycristanho cindyycristanho
  • 14-07-2017
try by multiplying 0.3x20
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irspow
irspow irspow
  • 14-07-2017
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%)




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