[升學考試] 統計學問題

誰可以幫我解答一下(a)The following distributions of X and of Y have been developed. If X and Y are independent

determine the joint probability distribution of X and Y.x　　0　　1　　2-----------------------------P(x)　.6　　.3　 .1y　　1　　2---------------------P(y)　.7　 .3(b)After analyzing several months of sales data

the owner of an appliance store produced the following joint probability distribution of the number of refrigerators and stoves sold daily.　　　　　　RefrigeratorsStoves　　0　　1　　2---------------------------------0　　　　.08　.14　.121　　　　.09　.17　.132　　　　.05　.18　.04(1)Find the marginal probability distribution of the number of refrigerators sold daily.(2)Find the marginal probability distribution of the number of stoves sold daily.(3)Compute the mean and variance of the number of refrigerators sold daily.(4)Compute the mean and variance of the number of stoves sold daily.(5)Compute the covariance and the coefficient of correlation.(C)Suppose X is a binomial random variable with n=25 and p=.7. Use Table 1 to find the following.(1)P(X=18)(2)P(X-15)(3)P(X