Question

1.Let X be a binomial random variable with mean 9 and variance 4.5. Find P(X = 9). ( )

2.,A wildlife biologist examines frogs for a genetic trait that may possibly be linked to industrial toxins in the environment. This trait is usually found in 1 of every 7 frogs, so the prevalence is 0.143. A sample of 92 frogs are collected and examined.  (Enter all probabilities with 3 decimal points.) What is the probability that at least 9 frogs in the sample have this trait? ( )

Answer 1

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