SOLUTION: In the book A Guide to the Development and Use of the Myers-Briggs Type Indicators by Myers and McCaully, it was reported that approximately 45% of all university professors are ex

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Question 375851: In the book A Guide to the Development and Use of the Myers-Briggs Type Indicators by Myers and McCaully, it was reported that approximately 45% of all university professors are extroverted. Suppose you have classes with five different professors.
What is the probability that all five are extroverts?
What is the probability that none of your professors is an extrovert?
What is the probability that at least two of your professors are extroverts?
In a group of five professors selected at random, what is the expected number of extroverts? 2.25
What is the standard deviation of the distribution? 1.11
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.45%5E5+=+0.0184528
0.55%5E5+=+0.0503284
1+-+C%285%2C0%29%2A0.45%5E0%2A0.55%5E5+-+C%285%2C1%29%2A0.45%5E1%2A0.55%5E4+=+0.7437825
The last two answers are correct.