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I would like to know why my answer is wrong for this probability distribution question? The distribution of weights of health club members is normally

I would like to know why my answer is wrong for this probability distribution question?

The distribution of weights of health club members is normally distributed with mean 200 and standard deviation 50. If a sample of 10 members is taken, what is the Z-score for an average weight of 130? Select one: a. -0.40 b. 4.50 X c. 2.05 d. 1.65

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