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6. A recent study examined the one-way commute times in the 30 largest cities in the United States. The longest one-way trave
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a)

z(30)=(30-39.7)/7.5

z(30)=-1.293

P(z<-1.293)=0.0979 or 9.79%

b)

z(30)=-1.293

z(35)=(35-39.7)/7.5=-0.627

P(-1.293<z<-0.627)=P(z<-0.627)-P(z<-1.293)

=0.2654-0.0979

=0.1675 or 16.75%

c)

z(30)=-1.293

z(50)=(50-39.7)/7.5=1.373

P(-1.293<z<1.373)=P(z<1.373)-P(z<-1.293)

=0.9152-0.0979

=0.8172 or 81.72%

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