I have no idea if this is right....
for a i get .021%
for b i get 3
for c i get 24.38%
please help asap!
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Let me remind the binomial probability formula, an event out of times exactly with probability is, .
For the second you need to find such as, is maximized.
Basic trail and error, you get,
For the third to first.
You need to find, (m=3,4,5,....,20) because "at least" ...
You can add them up but that is the n00bish way of doing this problem. It is easier to find,
Now from one subtract that to get,
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