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Find the z-scores that bound the middle

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Reference no: EM132464772

Answer the following questions. As always, the z-score stands for a standard normal random variable.

(a) P(z = 2)

(b) Find the z-scores that bound the middle 50% of the area under the standard normal curve.

(c) Find the proportion of a normally distributed population that has values that are more than 0.75 standard deviations greater than the mean.

(d) Suppose x is a normally distributed variable with µ = 12.5 and σ = 3.2. What probability question for z is equivalent to P(7 < x < 11.9)?

Reference no: EM132464772

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