Please help me with the work attached below.

C The Time Required For An A PDi Math 227 meeting notes (4- + V earn.laccd.edu/courses/96450/quizzes/590057/take d drag to the Favorites Bar folder. Or import from another browser. Import favorites D Question 1 Time Run 8 pts Attempt du 2 Hours, Ellen is taking 4 courses for the semester. She believes that the probability distribution function for the number of courses in which she will get an A grade is given below. X 0 1 2 3 4 P(X) 0.10 0.50 0.20 0.15 0.05 a) (2 pts) What is the random variable in this problem? Describe it. b) (3 pts) What is the probability that Ellen will get at least 2 A's? c) (3 pts) Find the mean and standard deviation the probability distribution. Show work. If you used a calculator function, state which one and write what you typed in your calculator to get your answer. Round to 2 decimal places. HTML Editor :29 BIUA AT= = = FIX : & & N V X G V VD 1 12 pt e e W PrtSon Home End PgUp F3 F4 F5 F6 F7 F8 F9 F10 % &