THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The time it takes to assemble an electronic component is normally distributed with a mean of 17.2 minutes and a standard deviation of 3.1 minutes.
-The median score for the final exam in a statistics class was 85 and 20 percent of the students received a grade greater than 90.What is the probability that a randomly selected exam had a score between 85 and 90?
A)80 percent
B)30 percent
C)50 percent
D)There is not sufficient information to answer this question.

Question

Quizplus · Accepted Answer

The median is 85, meaning 50% scored below and 50% scored above. Since 20% scored above 90, the probability of scoring between 85 and 90 is 50% - 20% = 30%.