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

Question

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

Answer 1

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 $P (Z .1 .25) = 1 - P (Z < 1.25) = 1 - 0.8944 = 0.1056$
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 $P (- 0.25 < Z < 0.55) = P (0.55) - P (Z < - 0.25) = 0.7088 - (1 - 0.5987) = 0.3075$

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

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