Skip to content

Course home

Sign up

4.1.1 Probability (A-level only)

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485
Question 17

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]
Markscheme

4.1.1 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.1.1 Probability (A-level only)

111 exam-style questions on WJEC A Level Maths 4.1.1 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

Question bank