SOLUTION: A mathematics professor gives an "extra-credit" (bonus marks) problem on a test. If it is done correctly, 15 points are added to the test score, and if it is done partially corre

Question 1160748: A mathematics professor gives an "extra-credit" (bonus marks) problem on a test. If it
is done correctly, 15 points are added to the test score, and if it is done partially
correctly, 5 points are added; otherwise 5 points are subtracted. Suppose a student's
probability of getting the problem completely right is 1
4
, and only partially correct is 1
2
.
Find the student's mathematical expectation 𝐸 (expected value) for extra credit.
Answer by ikleyn(52811) (Show Source): You can put this solution on YOUR website!
.

Look into your post, how it appears at the forum,

and try to understand, what is written there.

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