Normal distribution

TABLE 3 Areas Under the Normal Curve $z = \frac{x ? ?}{?}$ The serum cholesterol levels of 12- to 14 -year-olds follow a normal distribution with mean $162 mg / dl$ and standard deviation $28 mg / dl$ . What percentage of 12 to 14 -year-olds have serum cholesterol values (a) 171 or more? (b) 143 or less? (c) 194 or less? (d) 105 or more? (e) between 166 and 194? (f) between 105 and 138 ? (g) between 138 and 166 ?

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Normal distribution

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TABLE 3 Areas Under the Normal Curve

z = \frac{x ? ?}{?}

The serum cholesterol levels of 12- to 14 -year-olds follow a normal distribution with mean

162 mg / dl

and standard deviation

28 mg / dl

. What percentage of 12 to 14 -year-olds have serum cholesterol values (a) 171 or more? (b) 143 or less? (c) 194 or less? (d) 105 or more? (e) between 166 and 194? (f) between 105 and 138 ? (g) between 138 and 166 ?

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