Use R to find the following probabilities: a) Pr{Z < 4.05} b) Pr{Z > -0.75} c) Pr{-1.35 < Z < 1.35} d) Pr{-1.8 < Z < 1.1} e) Pr{Z < -1.35 or Z > 1.35} (you want the probability outside the range -2.67 to 2.67)

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Use R to find the following probabilities:
a) Pr{Z < 4.05}

b) Pr{Z > -0.75}

c) Pr{-1.35 < Z < 1.35}

d) Pr{-1.8 < Z < 1.1}

e) Pr{Z < -1.35 or Z > 1.35} (you want the probability outside the range -2.67 to 2.67)

Expert Solution
Step 1

Here, we consider Z as a standard normal distribution, i.e., Z~N(0,1). Theoretically,

a.)P[Z<4.05]=Φ(4.05)b.)P[Z>-0.75]=1-P[Z-0.75]=1-Φ(-0.75)=1-{1-Φ(0.75)}=Φ(0.75)c.)P[-1.35<Z<1.35]=P[Z<1.35]-P[Z-1.35]=Φ(1.35)-Φ(-1.35)=Φ(1.35)-{1-Φ(1.35)}=2Φ(1.35)-1d.)P[-1.8<Z<1.1]=P[Z<1.1]-P[Z-1.8]=Φ(1.1)-Φ(-1.8)=Φ(1.1)-{1-Φ(1.8)}=Φ(1.1)+Φ(1.8)-1e.)P[Z<-1.35 or Z>1.35]=P[Z<-1.35]+P[Z>1.35]=Φ(-1.35)+{1-P[Z1.35]}=1-Φ(1.35)+1-Φ(1.35)=2(1-Φ(1.35))Also,P[Z<-2.67 or Z>2.67]=P[Z<-2.67]+P[Z>2.67]=Φ(-2.67)+{1-P[Z2.67]}=1-Φ(2.67)+1-Φ(2.67)=2(1-Φ(2.67))

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