If 25% of the people <em>are</em> vaccinated, then 75% of the people are <em>not</em> vaccinated. Of those not vaccinated, each has a 50% chance of contracting the disease. The probability that someone is both not vaccinated and contracts the disease is (0.75)(0.5)=0.375.
The probability that someone is vaccinated and contracts the disease is (0.25)(0.1)=0.025 (it is multiplied by 0.1 because if the vaccine is 90% effective, then there is a 10% chance someone that is vaccinated can contract the disease.
Add these together for the total: 0.375+0.025=0.4
There is a 40% chance that someone chosen at random will contract the disease.
I think it's different by
Group 2 has a 1 yet group 2 didn't sorry if wrong
Draw two lines that never intersects and those are parallel line. A compass and straightedge helps you make the lines straight.
The expected return of the portfolio consisting of 50% tsla and 50% sbux will be given by:
E(r)=WbReturn+WaReturn
E(r)=0.5(4.73)+0.5(1.72)
E(r)=2.365+0.86
E(r)=3.225%
