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cathyhu0829 · 2020年02月04日

问一道题:NO.PZ2020010301000009

问题如下:

Credit card companies rapidly assess transactions for fraud. In each day, a large card issuer assesses 10,000,000 transactions. Of these, 0.001% are fraudulent. If their algorithm identifies 90% of all fraudulent transactions but also 0.0001% of legitimate transactions, what is the probability that a transaction is fraudulent if it has been flagged?

选项:

A.

90%

B.

80%

C.

95%

D.

10%

解释:

We are interested in Pr(Fraud|Flag). This value is Pr(Fraud∪Flag)/Pr(Flag). The probability that a transaction is flagged is

.001% * 90% + 99.999% * 0.0001% = .000999%.

The Pr(Fraud∪Flag) = .001% * 90% = .0009.

Combining these values,

.0009 /.000999 = 90%.

This indicates that 10% of the flagged transactions are not actually fraudulent.

请问什么叫flagged

1 个答案

品职答疑小助手雍 · 2020年02月07日

同学你好,flaged指的是标记的,也就是their algorithm identifies的90%的欺诈的,和0.0001%的没欺诈的