Sect. 5-2, p. 209 Identifying Probability Distributions. In Exercise 7-12, determine whether a probability distribution is given. In those cases where a probability distribution is not described, identify the requirements that are not satisfied. In those cases where a probability distribution is described, find its mean and standard deviation. (see example on p. 206, 207)

#7. Genetic Disorder. Three males with an X-linked genetic disorder have one child each. The random variable x is the number of children among the three who inherit the X-linked genetic disorder.

X P(x)

0 0.4219

1 0.4219

2 0.1406

3 0.0156

Answer: µ = σ =