i have a problem in second question and part b and c if you

i have a problem in second question and part (b) and (c) if you help me it would be greate..

A within a target time is 0.75, whereas, if another company is awarded is awarded the project, the probability of on-time completion of project A is only 0.5.

Solution

The information given is tabulated as follows for easy reference.

Sample size = 170000

Women having cancer = 4500

Sample proportion = 0.0265

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Received two independents test positive

Chance for having cancer = P(both tests give correct result)

=0.95(0.95)

= 0.9025

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If 3 positive results are got prob for having real cancer

= P(3 positive results and having real cancer)/P(having real cancer)

=(0.95)³= 0.857375

	Positve	Negative
woman has cancer	95%	5%
woman does not have cancer	1%	99%