SOLUTION: Suppose that 12% of the population are left-handed. What's the probability that there are more than 20 left-handed in a school of 200 sudents?
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Question 1140898: Suppose that 12% of the population are left-handed. What's the probability that there are more than 20 left-handed in a school of 200 sudents? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! Can use normal approximation
np=mean=24 expected
np(1-p)=variance=24*0.88=21.12
sd = sqrt (variance)=4.60
normal approximation
z>(20.5-24)/4.6 using continuity correction factor
>-3.5/4.6
>-0.76
probability is 0.7764
