SOLUTION: The probability that an individual is left-handed is 0.13. In a class of 20 students, use the binomial distribution to determine what is the mean and standard deviation of the numb

Question 1121569: The probability that an individual is left-handed is 0.13. In a class of 20 students, use the binomial distribution to determine what is the mean and standard deviation of the number of left-handers in the class?
a. mean: 2.6; standard deviation: 1.61
b. mean: 2.6; standard deviation: 1.50
c. mean: 20; standard deviation: 1.50
d. mean: 20; standard deviation: 1.61
have a look please
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
mean is np or 20*0.13 or 2.6
sd is sqrt (variance), and V=np(1-p) or 2.6*0.87=2.262
sqrt(2.262)=1.50
c
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