Jeff's favorite hobby is hiking. The amount of time he spends hiking is negatively correlated with the amount of work he has, with a correlation coefficient of -.6. The amount of time he spends hiking is normally distributed with a mean of 60 min/ day and a standard deviation of 20 minutes. The amount of time he spends at work is normally distributed with a mean of 180 min and a standard deviation of 45 min. A) what is the covariance of time Jeff spends on knitting and the time he spends on work a day? B) what is the expected total of time Jeff spends knitting and doing work on a given day? C) what is the standard deviation of the amount of time Jeff will spend hiking and going to work in a given day