Using the Standard Normal Table from the online lectures this week, what is the

alesterp 2021-11-06 Answered
Using the Standard Normal Table from the online lectures this week, what is the area under the standard normal curve:
a) To the left of a z-score of 1.25
b) To the right of a z-score of 1.25
c) Between the z-scores -0.25 and 0.55
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Expert Answer

sovienesY
Answered 2021-11-07 Author has 89 answers

Step 1
To the left of Z score of 1.25 from Standard Normal probability table,
from Standard Normal probability table,
z row 1.2 and z column 0.05 the value is 0.8944
Hence P(Z<1.25)=0.8944
Step 2
To the right of Z score of 1.25
from Standard Normal probability table,
z row 1.2 and z column 0.05 the value is 0.8944
Hence P(Z.1.25)=1P(Z<1.25)=10.8944=0.1056
Step 3
Between the Z-Scores -0.25 and 0.55
from Standard Normal probability table,
z row 0.2 and z column 0.05 the value is 0.5987
z row 0.5 and z column 0.05 the value is 0.7088
Hence P(0.25<Z<0.55)=P(0.55)P(Z<0.25)=0.7088(10.5987)=0.3075

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