Consider Stock Drive Products catalog number 1B2-N24084 brass spur gear with 84 teeth. 14 pressure angle , and 24 diametral pitch. For a standard gear like this the addendum is a = 1/Pd Answer the f

For the portfolio with weights of 0.6 in T-bills and 0.4 in the S&P 500 index, the expected return can be calculated as follows: Expected return = (0.6 x 0.06) + (0.4 x 0.08) = 0.068 or 6.8% The variance can be calculated as: Variance = (0.6^2 x 0) + (0.4^2 x 0.28^2) + (2 x 0.6 x 0.4 x 0.28 x 0) = 0.0125 or 1.25% For the other portfolios with different weights, the expected return and variance can be calculated in a similar manner using the given data. It is important to note that the expected return is the weighted average of the expected returns of the individual assets, while the variance takes into account the covariance between the assets as well.