In a certain region, the probability that any given

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2022-02-25

In a certain region, the probability that any given day in October is wet is 0.16, independently of other days.(a) Find the probability that, in a 10-day period in October, fewer than 3 days will be wet.(b) Find the probability that the first wet day in October is 8 October.(c) For 4 randomly chosen years. find the probability that in exactly 1 of these years the first wet day in October is 8 October.

Answer & Explanation

RizerMix

RizerMix

Expert2023-04-23Added 656 answers

To solve this problem, we can use the binomial distribution, which gives us the probability of getting a certain number of successes in a fixed number of independent trials.

Let X be the number of wet days in a 10-day period in October. Then X follows a binomial distribution with parameters n = 10 (the number of trials) and p = 0.16 (the probability of success).

We want to find P(X<3), the probability that fewer than 3 days will be wet. We can calculate this using the cumulative distribution function (CDF) of the binomial distribution:

P(X<3)=P(X=0)+P(X=1)+P(X=2)

Using the formula for the probability mass function (PMF) of the binomial distribution, we can calculate these probabilities as follows:

P(X=k)=(n choose k)pk(1-p)n-k

where (n choose k)=n!k!(n-k)! is the binomial coefficient.

Plugging in the values of n and p, we get:

P(X=0)=(10 choose 0)0.160(1-0.16)10-0=0.326

P(X=1)=(10 choose 1)0.161(1-0.16)10-1=0.384

P(X=2)=(10 choose 2)0.162(1-0.16)10-2=0.230

Therefore,

P(X<3)=P(X=0)+P(X=1)+P(X=2)=0.326+0.384+0.230=0.940

So, the probability that in a 10-day period in October, fewer than 3 days will be wet is 0.940.

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