\((1/3)^9\)
To solve for \(P(X = 0)\) in the given binomial distribution, we need to use the properties of a binomial distribution and the information provided about its mean and standard deviation.
The parameters of a binomial distribution are:
The mean \(\mu\) of a binomial distribution is given by:
\(\mu = n \cdot p\)
The standard deviation \(\sigma\) of a binomial distribution is given by:
\(\sigma = \sqrt{n \cdot p \cdot (1-p)}\)
From the problem, we know:
We set up the equations using the given mean and standard deviation:
\(n \cdot p = 6\) (Equation 1)
\(\sqrt{n \cdot p \cdot (1-p)} = \sqrt{2}\)
Squaring both sides of the second equation gives:
\(n \cdot p \cdot (1-p) = 2\) (Equation 2)
Now, substituting the value of \(n \cdot p\) from Equation 1 into Equation 2:
\(6 \cdot (1-p) = 2\)
\(6 - 6p = 2\)
Solving for \(p\):
\(4 = 6p\)
\(p = \frac{2}{3}\)
Substituting \(p = \frac{2}{3}\) back into Equation 1 to solve for \(n\):
\(n \cdot \frac{2}{3} = 6\)
\(n = 6 \cdot \frac{3}{2} = 9\)
The probability \(P(X = 0)\) is given by the binomial probability formula for \(X = 0\):
\(P(X = 0) = \binom{n}{0} \cdot p^0 \cdot (1-p)^n\)
Where:
Therefore,
\(P(X = 0) = (1-p)^n = \left(\frac{1}{3}\right)^9\)
Hence, the value of \(P(X = 0)\) is \(\left(\frac{1}{3}\right)^9\).
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