Area between z = -1.5 and z = 2.5.

Question

Find the area under the standard normal curve between z = -1.5 and z = 2.5.

Answer 1

Standard Normal Probability table for Z scores you find the following probabilities by looking up Z=2.5 and Z=-1.5:

P(Z< 2.5) = .9938

P(Z< -1.5) = .0668

the area between the two we subtract the smaller from the larger:

P(Z< 2.5) - P(Z< -1.5) = = .9938 - .0668 = .9270

Answer 2

Using a Standard Normal Probability table for Z scores you find the following probabilities by looking up Z=2.5 and Z=-1.5:

P(Z< 2.5) = .9938

P(Z< -1.5) = .0668

Then because we need the area between the two we subtract the smaller from the larger:

P(Z< 2.5) - P(Z< -1.5) = = .9938 - .0668 = .9270

P(-1.5 < Z < 2.5) = .9270