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According to the Busselton Health Study, total blood cholesterol (mmol/L) in males over 55 years old is Normally distributed with mean 6.0. About 68% of

According to the Busselton Health Study, total blood cholesterol (mmol/L) in males over 55 years old is Normally distributed with mean 6.0. About 68% of males in this age group have total blood cholesterol levels between 5.1 and 6.9.

The best estimate of the standard deviation is

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