本期题目：
In the National Health and Nutrition Examination Survey, 80.5%of the participants had healthy levels ofhigh-density lipoprotein (HDL) cholesterol, the estimate has a margin of errorof 1.5% at aconfidence level of 95%. The participants were arandom sample of United States (US) residents. If the US population at the timeof the study was 316 million people, what is the estimate at a 95% confidence level of the number of people in the US who hadhealthy levels of HDL cholesterol?
A. 237 million to 246 million people
B. 245million to 264 million people
C. 250 million to 259 million people
D. 254 million to 300 million people
答案分割线
数学题： C
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