Solution :
Given that,
Using standard normal table ,
a.
P(-1.98 z 0.49)
= P(z 0.49) - P(z -1.98)
= 0.6879 - 0.0239
= 0.6640
P(-1.98 z 0.49) = 0.6640
b.
P(0.51 z 1.26)
= P(z 1.26) - P(z 0.51)
= 0.8962 - 0.6950
= 0.2012
P(0.51 z 1.26) = 0.2012
c.
P(-1.75 z -1.09)
= P(z -1.09) - P(z -1.75)
= 0.1379 - 0.0401
= 0.0978
P(-1.75 z -1.09) = 0.0978
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