1.
=70%*10%+30%*4%
=8.20%
2.
Let w be the weight in risky portfolio
=w*10%+(1-w)*4%
=4%+6%*w
3.
=70%*20%
=14%
4.
=(20%-8.20%)/14%
=0.84
5.
=Prob(R<0%)
=Prob(Z<(0%-8.20%)/14%)
=Prob(Z<-0.59)
=0.27903377
6.
=Prob(R>25%)
=Prob(Z>(25%-8.20%)/14%)
=Prob(Z>1.20)
=1-Prob(Z<1.20)
=1-0.88493033
=0.11506967
7.
=Prob(-10%<R<15%)
=Prob(R<15%)-Prob(R<-10%)
=Prob(Z<(15%-8.20%)/14%)-Prob(Z<(-10%-8.20%)/14%)
=Prob(Z<0.49)-Prob(Z<-1.30)
=0.68793305-0.09680048
=0.59113257
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