SOLUTION: Find the area under the normal curve to the left of z=−1.55 plus the area under the normal curve to the right of z=2.55

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Question 1201566: Find the area under the normal curve to the left of z=−1.55 plus the area under the normal curve to the right of z=2.55
Answer by ikleyn(52879) About Me  (Show Source):
You can put this solution on YOUR website!
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It is the same as to subtract from the total area under this curve 
part of the area under this curve between the marks z= -1.55 and z= 2.55.


Use function normalcdf of your regular calculator

    the area of the interest = 1 - normalcdf(-1.55, 2.55, 0,1) = 1 - 0.934 = 0.066    (rounded).    ANSWER


normalcfd stands for normal cumulative distribution function.

                          z1     z2   mean  SD   <<<---=== formatting pattern
Its format is  normalcdf(-1.55, 2.55, 0,    1).

Solved.