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The variance of a binomial distribution for which n=100 and p=0.20 is

What percentage of the area under the normal curve falls within one standard deviation of the mean?

Determine the joint probability from the given probabilities. (Hint: use a probability tree) P(A)=.8  P(B|A)=.4 P(A’)=.2 P(B|A’)=.7 What is the P(A and B)?

If two events are complementary, then we know that

A random variable X is best described by a continuous uniform distribution from 20 to 45 inclusive. The standard deviation of this distribution is approximately Note:  σ = ( b – a ) 2 12 1 / 2

Which of the following are required conditions for the distribution of a discrete random variable?

A random variable 

Which best exemplifies the classical definition of probability?

The list of all possible outcomes in a probability experiment is called 

If we have two events, A and B, what do we call the probability of their intersection?