Math  /  Data & Statistics

Question9. Rafa serves again! Tennis superstar Rafael Nadal's first-serve speeds in a recent season can be modeled by a normal distribution with mean 115 mph and standard deviation 6 mph . Use the empirical rule to approximate the following: (a) The proportion of Rafa's first serves that were faster than 121 mph (b) The percent of Rafa's first serves with speeds between 109 and 133 mph
10. Cholesterol modeled Cholesterol levels for teenage boys can be modeled by a normal distribution with mean 150mg/dl150 \mathrm{mg} / \mathrm{dl} and standard deviation

Studdy Solution
(a) Approximately **16%** of Rafa's first serves were faster than 121 mph. (b) Approximately **83.85%** of Rafa's first serves were between 109 and 133 mph.

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