# Question: Verify the expression given for E X X 1 in the

Verify the expression given for E[X(X – 1)] in the proof of Theorem 5.7.

## Relevant Questions

Show that if we let θ = M/N in Theorem 5.7, the mean and the variance of the hypergeometric distribution can be written as µ = nθ and σ2 = nθ(1– θ) ∙ N – n / N – 1 . How do these results tie in with the ...Use repeated integration by parts to show that This result is important because values of the distribution function of a Poisson random variable may thus be obtained by referring to a table of incomplete gamma functions. Use the result of Exercise 5.3 to show that for the Bernoulli distribution, (a) α3 = 1 – 2θ / √(1 - θ), where α3 is the measure of skewness defined in Exercise 4.26 on page 129; (b) α4 = 1 – 3θ(1 - θ) / √(1 - ...In planning the operation of a new school, one school board member claims that four out of five newly hired teachers will stay with the school for more than a year, while another school board member claims that it would be ...When taping a television commercial, the probability is 0.30 that a certain actor will get his lines straight on any one take. What is the probability that he will get his lines straight for the first time on the sixth take? ...Post your question