Probability help please 10 points
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Probability help please 10 points

[From: ] [author: ] [Date: 11-09-07] [Hit: ]
Pr = 0.7*0.05 + 0.3*0.6 = 0.215 or 21.......
This year, 70% oft he population have been immunised against a certain disease. Records indicate tat an immunised person has a 5% chance of contracting the disease whereas for a non- immunised person this figure is 60%. Calculate the overall percentage of the population who are expected to contract the disase.

(answer is 21.5%) please show working for 10 pts

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using the law of total probabilty,

Pr = 0.7*0.05 + 0.3*0.6 = 0.215 or 21.5% <---------
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