Abstract
This chapter discusses the binomial and Poisson distributions. The binomial distribution is a probability distribution of a variate x that takes the values 0, 1, 2, … n, with probabilities P1, P2, P3, … Pn given by the terms of the expansion of (q + p)n. The Poisson distribution is applicable in two different circumstances: (1) as an approximation to the binomial distribution and (2) when the variates occur in a random manner. Using the Poisson instead of the binomial distribution can reduce calculations quite considerably. The defective resistors are assumed to occur at random and this is, therefore, a Poisson distribution. The combination of two Poisson distributions with means a and b is itself a Poisson distribution with mean a + b.
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