solution:
given
= 100
= 5.3
n = 80
To find P( < 98.5):
=p(-/ /<98.5-100/ 5.3/)
=p(z<-1.5/0.592558)
=p(z<-2.5313)
=1-p(z<2.5313)
=1-0.9943(from table)
=0.0057
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