What proportion of a normal distribution is located between each of the following z-score boundaries?

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	Answer
z = -1.96 and z = +1.96
z = -2.58 and z = +2.58
z = -1.00 and z = +2.99

Find each of the following probabilities for a normal distribution.

	Answer
p (-1.80 < z < 0.20)
p (-0.40 < z < 1.40)
p (0.25 < z < 1.25)

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