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Use the standard normal tables to find ##P(z gt -1.22)##.
P( z > -1.22 ) = 1 - P( z < -1.22 ) By symmetry of the Normal Distribution =1 - F( -1.22 ) where F represents the value you look for in the standard normal tables. =1 - ( 1 - F(1.22) ) Again, by symmetry of N(0,1) =F( 1.22 ) By simplifying. =0.8888 (value from the table)