One thousand people are screened for a certain disease and classified as in the
ID: 3158252 • Letter: O
Question
One thousand people are screened for a certain disease and classified as in the following table. Disease Status ------------------------------------------------ Age None Mild Moderate Severe Totals ---------------------------------------------------------------------------------- 18 – 40 213 51 33 23 320 Over 40 430 121 98 31 680 -------------------------------------------------------------------------------- Totals 643 172 131 54 1,000 If one individual is selected at random from this population, what is the probability of selecting someone who is in the 18 – 40 age group or has a severe form of the disease? a. 0.286 b. 0.374 c. 0.351 d. 0.023 3. Which of the following numbers can represent a probability?
Explanation / Answer
If one individual is selected at random from this population, what is the probability of selecting someone who is in the 18 – 40 age group or has a severe form of the disease?
From the table,
P(18-40 OR Severe) = n(18-40 OR Severe)/N(total) = (213 + 51 + 33 +23 + 31)/1000 = 0.351 [ANSWER, C]
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