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A binomial event has n = 60 trials. The probability of success on each trial is 0.4. Let X be the count of successes of the vent during the 60 trials. Whart are the $$\mu\_x$$ and $$\sigma\_x$$? 
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$$\mu\_X = 60 * 0.4 = 24$$  $$\sigma\_X = \sqrt{60*0.4*0.6} = 3.79$$ 