Question

The world had been harmed by a widespread Z-virus, which already turned 5% of the world's
population of 1Bn into zombies. The scientists then invented a test kit is 90% accurate i.e. it
produces correct result in 90% of tests. If your test kit showed positive result, what would be the
probability that you are truly a zombie? Draw Venn’s diagram and outcomes tree.

Answer 1

The solution to this problem is given by