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Find the z-scores for the sample mean for each of the following samples obtained from a...

Find the z-scores for the sample mean for each of the following samples obtained from a population with a μ = 50 a n d σ = 12 . Assume normal distribution.

a. M = 56 for a sample of n = 4

b. M = 42 for a sample of n = 9

c. M = 51 for a sample of n =36

Math   Statistics-And-Probability   
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