A company decided to check on the accuracy of invoicing
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A company decided to check on the accuracy of invoicing

A company decided to check on the accuracy of invoicing. Invoices are prepared by Alicia, Linda and Jane. A sample of 500 invoices are selected. Two hundred were prepared by Alicia, 120 by Linda and 180 by Jane. The error rates of Alicia, Linda and Jane were found to be 2%, 3% and 4% respectively. From the sample of 500 invoices, one invoice was selected.

1- Draw a tree diagram for the above information. BSM 1013 (BBA Hons)  October, 2020

2- What is the probability that the invoice contains an error?

3- What is the probability that the invoice was prepared by Alicia, given that it contains no error?

Hint
StatisticsProbability is the branch of mathematics in which it shows the numerical descriptions of how likely an event is to occur, or even shows that how likely it is that the proposition would be true. Therefore, the probability of an event is a number between the 0 and 1. In this, basically, 0 indicates the impossibility of the event and 1 indicates the certainty....

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