upposed that in south africa the serum cholesterol level for males is normally distributed with a mean of 141 mg/dL and standard deviation of 11 mg/dL. Forturemore, suppose that a sample of 42 males is randomly selected from the south african population. Determine the probability tha the sample mean cholesterol level will be between 121,31 mg/dL and 154, 75 mg/dL
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