统计概率的计算,Your store is interested in learning more about customers’ purchasingpatterns and how they relate to the frequency of store visits.The probabilitythat a customer’s visit will result in a purchase is 0.35.The probability that

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统计概率的计算,Your store is interested in learning more about customers’ purchasingpatterns and how they relate to the frequency of store visits.The probabilitythat a customer’s visit will result in a purchase is 0.35.The probability that
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统计概率的计算,Your store is interested in learning more about customers’ purchasingpatterns and how they relate to the frequency of store visits.The probabilitythat a customer’s visit will result in a purchase is 0.35.The probability that
统计概率的计算,
Your store is interested in learning more about customers’ purchasing
patterns and how they relate to the frequency of store visits.The probability
that a customer’s visit will result in a purchase is 0.35.The probability that
a customer has been to the store within the past month is 0.20.Of those who
did not buy anything,12% had been there within the past month.
a.Find the probability of making a purchase given that the customer had been to the store within the past
month.
b.What percent of customers are frequent shoppers,defined as making a purchase and having been to thestore within the past month?
答案分别是：0.61 & 0.122

统计概率的计算,Your store is interested in learning more about customers’ purchasingpatterns and how they relate to the frequency of store visits.The probabilitythat a customer’s visit will result in a purchase is 0.35.The probability that
a.0.20*0.35=0.07
b.0.20-(1-0.35)*0.12=0.122

a. 0.20*0.35=0.07
b. 0.20-(1-0.35)*0.12=0.122第一个答案是:0.61额。。题目的意义太拗口。 1.顾客进入商店后消费的概率是0.35。 2.顾客曾经在一个月内来过的概率是0.20. 3.没有消费的顾客中，12%的人一个月内没有来过。 问：a.一个月内来过商店的顾客做出消费的概率。 b.常客，即一个月内来...

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a. 0.20*0.35=0.07
b. 0.20-(1-0.35)*0.12=0.122

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其实我觉得题目的设置有点偏差，这里将0.35理解成购买的概率而不是进入商店购买的概率，用条件概率算就很容易了。。

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