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A studay has shown that 50% of the families in a certain large area have at...

A studay has shown that 50% of the families in a certain large area have at least two cars.

Find the probabilities that among 15 families randomly selected in this area .

a) 6 have fewer than two cars;

b) more than 9 have fewer than two cars

c) 7 have at lease two cars.

please pay attention to--- ask about "fewer than have two cars", also please show the detail of the formula. Thank you.

Math   Statistics-And-Probability   
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