SOLUTION: Suppose that a student needs to buy 6 books for her history course. She decides to look for used books. The number of used books that she will be able to find is a binomial random
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Question 1046745: Suppose that a student needs to buy 6 books for her history course. She decides to look for used books. The number of used books that she will be able to find is a binomial random variable X with probability to find any given used book equal to 0.30. These probabilities are independent from one book to the next.
which of the ffg statements is incorrect?
1. the expected number E(X) is 1.8
2.The standard deviation = 1.26
3.P(X=6)=0.0007
4.P(X=0)=01176
5.P(X_<6)=1.000 Answer by robertb(5830) (Show Source):
You can put this solution on YOUR website! 2.The standard deviation = 1.26.
The variance is 1.26 (=npq = 6*.3*.7), not the standard deviation.
