What is the probability of earning a score lower than 3? Standardized tests for certain subjects, given to high
school students, are scored on a scale of 1 to 5. Let X
represent the score on a randomly selected exam. The
distribution of scores for one subject's standardized test
is given in the table
O 0.20
O 0.26
O 0.38
O 0.64
Score
1
2
3
4
5
Probability
0.18
0.20
0.26
0.21
0.15