# Thread: Finding the area under the curve?

1. ## Finding the area under the curve?

Problem #14.Find the area under the normal curve. Z= 1.36. The answer is 0.0869. How do you get that?

Problem #16. Find the z-score that corresponds to the following probability: 0.7357 and z=?. The answer is -0.63. How did you get that. Here's a link for the graph.
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2. Originally Posted by rowdy3
Problem #14.Find the area under the normal curve. Z= 1.36. The answer is 0.0869. How do you get that?

Problem #16. Find the z-score that corresponds to the following probability: 0.7357 and z=?. The answer is -0.63. How did you get that. Here's a link for the graph.
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(14) From symmetry, calculate 1 - Pr(Z < 1.36).

(16) Using symmetry: 0.7357 = Pr(Z > -a) = 1 - Pr(Z < -a) = 1 - Pr(Z > a) = 1 - (1 - Pr(Z < a)) = Pr(Z < a).

Therefore a = invnorm(0.7357) = ..... Therefore - a = ......