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According to the Information Please Almanac. 80% o...

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According to the Information Please Almanac. 80% of adult smokers started smoking before turning 18 years old. Suppose 10 smokers 18 years old or older are randomly selected and the number of smokers who started smoking before 18 is recorded. Q.1. Find the probability that exactly 8 of them started smoking before 18 years of age. Q.2. Find the probability that at least 8 of them started smoking before 18 years of age. Q.3. Determine the area under the standard normal curve that lies between Z = -2.55 and Z = 2.55 Q.4. Find the Z-score such that the area under the standard normal curve to the left is 0.85. Q.5. Find the probability. P(Z<-0.61) Q.6. Find the probability. P(1.23,thank you so much for your help.

 

Paper#13240 | Written in 18-Jul-2015

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