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1. For a population with a mean of µ= 70, a score of X =64 corresponds to z = 21.50. What is the population standard deviation?
2. In a population distribution, a score of X =28 cor- responds to z = 21.00 and a score of X =34 cor- responds to z = 20.50. Find the mean and standard deviation for the population.
(Hint: Sketch the distri- bution and locate the two scores on your sketch.)
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