Question

1.determine the area and show this graphically

A. To the right of z=1.3

B. Between z=-1 and z=-2.3

2.find each of the following percentile points under the normal curve complete your procedure

A. P79

B. P90

Answer 1

1) A.$P(Z>1.3)=1-P(Z<1.3)=0.90320=0.0968$

B.$P(-2.3<Z<-1)=P(Z<-1)-P(Z<-2.3)=0.15866-0.01072=0.14794$

2) A. $P(Z<a)=0.79\implies a=0.807$

B. $P(Z<a)=0.9\implies a=1.282$