# Question

Find the z -score such that the interval within z standard deviations of the mean (between μ - zσ and μ + zσ) for a normal distribution contains

a. 50% of the probability.

b. 90% of the probability.

c. Sketch the two cases on a single graph.

a. 50% of the probability.

b. 90% of the probability.

c. Sketch the two cases on a single graph.

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