A normal distribution has μ = 80 and σ = 10. What is the probability of randomly selecting 75 < X < 85
"P(75<X<85)=P(\\frac{75-80}{10}<Z<{85-80}{10})=P(-0.5<Z<0.5)="
"=P(Z<0.5)-P(Z<-0.5)=P(Z<0.5)-(1-P(Z<0.5))="
"=2P(Z<0.5)-1=2*0.6915-1=0.3830."
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