SOLUTION: Suppose I have an unfair coin, it lands on heads 75% of the time. If I flip this coin four times, what is the probability that I will get 2 heads? What is the mean for number of he

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Question 1204802: Suppose I have an unfair coin, it lands on heads 75% of the time. If I flip this coin four times, what is the probability that I will get 2 heads? What is the mean for number of heads? Variance? Standard deviation?
Answer by Edwin McCravy(20055)   (Show Source): You can put this solution on YOUR website!
Binomial probability, with 

n = number of trials = 4 
p = probability of getting a success on 1 trial = 0.75
x = exact number of successes to get the probability of getting out of n trials.  




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What is the mean for number of heads? Variance? Standard deviation?

Mean = 
Variance = 
Standard deviation = 

You can plug in those formula as well as I can. You may have software to do
all this for you if you learn what's what.
 
Edwin
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