Given independent random variables, X and Y, with means and standard deviations as shown, find the mean and standard deviation of each of the variables in parts a to d. a)X-12 b) 0.4Y mx+v d)X-Y (I) a) Find the mean and standard deviation for the random variable X - 12. E(X - 12): 68 SD(X - 12) = 10 (Type integers or decimals rounded to two decimal places as needed.) b) Find the mean and standard deviation for the random variable 0.4Y. E(0.4Y)= 4.8 SD(0.4Y) = 1.2 (Type integers or decimals rounded to two decimal places as needed.) 0) Find the mean and standard deviation for the random variable X +Y. ax+w=j smx+w= (Type integers or decimals rounded to two decimal places as needed.)