SOLUTION: Suppose a student either has 1, 2, or 3 finals to take each with a respective probability of .19, .47, and .34 What is a student’s expected number of finals? What is th

Algebra ->  Finance -> SOLUTION: Suppose a student either has 1, 2, or 3 finals to take each with a respective probability of .19, .47, and .34 What is a student’s expected number of finals? What is th      Log On


   

Question 946707: Suppose a student either has 1, 2, or 3 finals to take each with a respective probability of .19, .47, and .34
What is a student’s expected number of finals?

What is the standard deviation?

Please show how you got your answer !!! Thanks In Advance !!!
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Expected score:
E=1%280.19%29%2B2%280.47%29%2B3%280.34%29
E=0.19%2B.94%2B1.02
E=2.15
.
.
.
Standard deviation:

sigma%5E2=0.2513%2B0.01058%2B0.24565
sigma%5E2=0.5075
sigma=0.71