Question

Please help with 3b

D Tor which this panf is valid. ซี.94477/909 9992 otherwise the denomirator i P(0-5) : Eo) 오 40 3. Consider the following distribution of letter grades in my courses from Spring 2018, with the discrete r variable y, measuring GPA (in the usual way: i.e, an A is 4 points, a B is 3 points, etc.): Grade ABICDIF P(Y ) 0.217 0.275 0.174 0.159 0.174 (a) Compute the expected value of Y. Use good notation and round to four decimal places E(-2.2 (b) Compute the variance of Y. Use good notation and round to four decimal places 02n MATH 381 Quest 1, Page 2

Answer 1