標題:
此文章來自奇摩知識+如有不便請留言告知
probability
發問:
An investigation about the patients in a clinic shows that there are 30% of patients aged 20 or below, 38% aged 21-30 and 32% aged 31 or above. For these three age groups, the percentages of males are 60%, 48% and 75% respectively. If a patient is a male, find the probability that he is aged 31 or above. (Give your... 顯示更多 An investigation about the patients in a clinic shows that there are 30% of patients aged 20 or below, 38% aged 21-30 and 32% aged 31 or above. For these three age groups, the percentages of males are 60%, 48% and 75% respectively. If a patient is a male, find the probability that he is aged 31 or above. (Give your answer correct to 2 decimal places.)
最佳解答:
Assuming there are n patients. Then number of male patients aged 20 or below=n x 30% x 60% number of male patients aged between 21 and 30=n x 38% x 48% number of male patients aged 31 or above =n x 32% x 75% Required probability = number of male patients aged 31 or above / number of male patients = n x 32% x 75% / (n x 30% x 60% + n x 38% x 48% + n x 32% x 75%) = 0.40 (2 d.p.)
其他解答:
留言列表
