Question

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.

A 2-column table with 5 rows. Column 1 is labeled score with entries 1, 2, 3, 4, 5. Column 2 is labeled Probability with entries 0.18, 0.20, 0.26, 0.21, 0.15.

What is the probability of earning a score of 3 or higher?

0.26
0.36
0.62
0.66

Answer 1

C. 0.62

Explanation:

probability of earning a score of 3 or higher means the probability we are trying to find includes 3,4,5 so we just add these together to get the probability of 3 and above

3 = 0.26

4= 0.21

5= 0.15

0.26+0.21+0.15= 0.62

Answer 2

It might be 0.36 or 0.66. Sorry if that doesn’t help