Posted by **LadyJustice85** on Wednesday, June 1, 2011 at 11:33am.

1. The sociologist surveyed the households in a small town. The random variable X represents the number of dependent children in the households. The following is the probability distribution of X:

X 0 1 2 3 4

P(X) 0.07 0.20 0.38 k 0.13

(a) Find the missing probability value of k

(b) Find the mean of X

(c) Find the standard deviation of X

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