solution:
a
using z table
p(z< 1.4)=0.9192
b
p(z<1.12) = 0.8686
c
= P( -0.89
z
1.35 )
= P(z
1.35 ) - P(z
-0.89)
Using z table,
0.9115 - 0.1867
=0.7248
d.
= P(0
z
2.42)
= P(z
2.42 ) - P(z
0 )
Using z table,
0.9922-0.5
=0.4922
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