Suppose the grading for a course project can only have 6 possible outcomes
Suppose the grading for a course project can only have 6 possible outcomes; 100, 90, 80, 70, 60, 50, and 0. Let the random variable X be the scores on the project. Suppose X has the following distribution:
|
X |
P(X=x) |
|
100 |
0.1 |
|
90 |
0.25 |
|
80 |
0.3 |
|
70 |
0.15 |
|
60 |
0.1 |
|
50 |
0.09 |
|
0 |
0.01 |
a. What is the probability that X is AT MOST 70?
b. What is the probability that X is AT LEAST 80%?
c. What is the probability that X is MORE than 80?
d. What is the probability that X is LESS than 70?
e. Compute the expected value for this random variable (see page 269 of text).
