Hi

Using chart, calculator or Excel function NORMSINV(P)to find z-score: 

a. 20% in the tail on the left NORMSINV(.20) = -.8416

b. 40% in the tail on the right    NORMSINV(60) = .2533

c. 75% in the body on the left   NORMSINV(.75)= .6745

d. 99% in the body on the right  NORMSINV(.01)=  -2.3263 

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