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For Population (N) = 150000, mean = 50 and Standard deviation = 4, Find the z value for each of the following for n=30. X_bar

For Population (N) = 150000, mean = 50 and Standard deviation = 4, Find the z value for each of the following for n=30.

X_bar = 58
X_bar = 45
X_bar = 63

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