Use the standard normal distribution to find P(-2.25 < z < 1.25).
2 Answers
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P(-2.25 < z < 1.25)
= P(z = 2.25) + P(z = 1.25)
= 0.48778 + 0.39435
= 0.88213
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The following table (see link) gives the area from 0 to a certain point.
P(-2.25 < z < 1.25) = P( 0 < x < 1.25) + P( 0 < x < 2.25)
0.3944+0.4878=0.8822
Note: P( -2.25 < x < 0) = P( 0 < x < 2.25) because of symmetry.
Source(s): http://people.hofstra.edu/stefan_waner/RealWorld/n...