PROBABILITY question (cringe)
The probability that it rains on any particular day during the 30 days of November is 0.1

Write an expression for the probability that it rains on fewer than 3 days in November.

Question

PROBABILITY question (cringe)
The probability that it rains on any particular day during the 30 days of November is 0.1

Write an expression for the probability that it rains on fewer than 3 days in November.

rvc · Answer

possible outcome ,p=0.3
since p+q=1
q=?

butterflydreamer · Answer

y = 1-p ?
y = 1 - 0.3 = 0.7 ?

rvc · Answer

correct :)
Now what condition is given?

butterflydreamer · Answer

err... i haven't done probability in class so i'm kinda just guessing here LOL.
condition is P ( <3 days rain) ?

butterflydreamer · Answer

i was thinking though..
wouldn't it just be something like:

P (rain) = 0.1
P (no rain) = 0.9
P (<3 days rain) = P(0 days) + P (1 day) + P(2 days)
?

welshfella · Answer

yes

butterflydreamer · Answer

yeah... but i'm not sure where to go from here?

welshfella · Answer

what's the probability it will rain on 2 days
you have p(0) and p(1)

butterflydreamer · Answer

hmm.
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