SOLUTION: the probability of making a mistake on any given day is 3/4. If I have an opportunity to make a mistake each day one per day for the next 7 days what is the probability I will make

Question 438077: the probability of making a mistake on any given day is 3/4. If I have an opportunity to make a mistake each day one per day for the next 7 days what is the probability I will make a mistake in at least 2 opportunities??
Help please...test is due and I haven't a clue!
Thank You Thank You!
joeboohoo
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the probability of making a mistake on any given day is 3/4. If I have an opportunity to make a mistake each day one per day for the next 7 days what is the probability I will make a mistake in at least 2 opportunities??
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Its binomial because you either make a mistake or you don't.
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n = 7 ; p = 3/4
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Each day you have probability of 3/4 to make a mistake and 1/4 to not
make a mistake.
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P(2<= x <=7) = 1 - P(0<= x <=1) = 1 - binomcdf(7,3/4,1) = 0.9987
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cheers,
Stan H.
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