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2.3.10 Conditional probabilities (A-level only)

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Question 38

A mobile game is available on three platforms. 60% of downloads are from the App Store, 25% from the Play Store, and 15% from a Web Download.

The probability that a download from the App Store results in a bug report is 1%. The probability that a download from the Play Store results in a bug report is 2%. The probability that a download from a Web Download results in a bug report is 6%.

a.

Draw a tree diagram to show this information.

[3]
b.

A download is selected at random. Find the probability it results in a bug report.

[2]
c.

Given that a download resulted in a bug report, find the probability it was from the Play Store.

[3]

2.3.10 Conditional probabilities (A-level only) Questions

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