1.) what is the standard deviation of portfolio returns

2.) what is the sharpe ratio of your portfolio? and explain what sharpe ratio means

The following describes the probability distribution of future returns for 2 stocks: Boom (60% chance) Bust (40% chance) 20% return Stock B 12% return Stock A 5% return 8% return Stocks A and B have betas of 1.3 and 0.9 respectively. You are holding a portfolio consisting of 70% stock A and 30% stock B. The risk-free rate is 1%