Use the binomial distribution.

1. 
   If n = 4 and p =.10 find P{x = 3}.
2. If n=7 and p=.80 find P{x = 4}.
3. 
   If n=10 and p=.60 find P{x>7}.
4. 
   If n=12 and p=.45 find P [5<x<7}

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