I need help with questions 16 and 17 please

Question 14 5 pts Calculate the variance of revenue per poncho. Four decimals : Question 15 5 pts ation, Four decimals Prot per poncho, Z. is revenue per poncho minus production cost per poncho (Z = R Y). Calculate expected prot per poncho. HINT: Use our result about the mean of a linear com S Question 16 5 pts Calculate the covariance between the number of ponchos (X) and cost per poncho (Y). Fourdecimals HINT: You must write down the joint distribution ofX and Y to obtain the covariance. This is not hard! It is a 4x4joint distribution. There are 4 rows (one for each value of Y) and 4 columns (one for each value of X). However, only the "diagonal" pairs of values occur with positive probability. This means there will be only four terms in the covariance. S Question 17 5 pts Calculate the covariance between revenue per poncho (R) and cost per poncho (Y). Five decimals HINT: You can calculate this second covariance from the covariance between X and Y, using our result about the effect of linear transformations on the covariance. S