calculate an equal weighted portfolio return and portfolio variance for the first portfolio using the below equations:
Equal weighted portfolio return:
E(RP) = w1(avg(r1)) + w2(avg(r2));
where w is the weight of each stock in the portfolio. And avg(r1) is the mean return for stock 1 and avg(r2) is the mean return for stock 2.
Portfolio variance:
σ2p = w12( σ2s1) + w22( σ2s2) + 2*w1 w2 * σs1 σs2