Homework Answers
Solution:
We have to find area under the standard normal curve between z = -1.80 and z = -0.23
that is find P( -1.80 < Z < -0.23) =...............?
P( -1.80 < Z < -0.23) =P( Z < -0.23) - P( Z < -1.80)
Look in z table for z = -0.2 and 0.03 as well as
for z = -1.8 and 0.00 and find corresponding
area.
P( Z< -0.23) = 0.4090
and
P( Z< -1.80) = 0.0359
thus
P( -1.80 < Z < -0.23) =P( Z < -0.23) - P( Z < -1.80)
P( -1.80 < Z < -0.23) = 0.4090 - 0.0359
P( -1.80 < Z < -0.23) = 0.3731
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