Homework help for intro to stats

Statistics
Tutor: None Selected Time limit: 1 Day

The nicotine content in a single cigarette of a particular brand has a distribution with mean 0.5 mg and standard deviation 0.1 mg. If 100 of these cigarettes are analyzed, what is the probability that the resulting sample mean nicotine content will be less than 0.49? (Round all answers to four decimal places.)

P( < 0.49) =  

Less than 0.47
P( < 0.47) =  
Apr 26th, 2015

ths std of mean is 0.1/sqrt(100)=0.01mg

z = (.49-0.5/.01=-1, 

Pr(x<0.49)=Pr(z<-1) = 0.1587

x=0.47

z= -0.03/.01= -3

Pr(x<0.47) = Pr(z<-3) = 0.0014

Apr 26th, 2015

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Apr 26th, 2015
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