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(b) Construct three types of portfolios. Portfolio A consists of any 3 of the stocks, Portfolio B consists of any 6 of the stocks, and Portfolio C consists of all 10 stocks. Assuming that each stock has equal weight in the portfolio, calculate Portfolio A, B, and C's average monthly returns, return variances and standard deviations, and betas. Summarize your results in a table, and briefly describe how these are calculated (Please do not use Excel functions as your explanation). (8 marks) (b) Construct three types of portfolios. Portfolio A consists of any 3 of the stocks, Portfolio B consists of any 6 of the stocks, and Portfolio C consists of all 10 stocks. Assuming that each stock has equal weight in the portfolio, calculate Portfolio A, B, and C's average monthly returns, return variances and standard deviations, and betas. Summarize your results in a table, and briefly describe how these are calculated (Please do not use Excel functions as your explanation). (8 marks)