The shares of companies Z and Y have the following expected returns and standard deviations: If the

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The shares of companies Z and Y have the following expected returns and standard deviations: 

Expected return (%) Standard deviation (%) N 15 20 Y 35 40

If the correlation coefficient between the two securities is +0.25, calculate the expected return and standard deviation for the following portfolios: 

(a) 100 per cent Z; 

(b) 75 per cent Z and 25 per cent Y; 

(c) 50 per cent Z and 50 per cent Y;

(d) 25 per cent Z and 75 per cent Y;

(e) 100 per cent Y.

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