Suppose that on a talent show like American Idol, the only contestants who actually make it onto the show must be at least 3 standard deviations above the mean in terms of their talent. What percentage of those who audition would you expect to actually make it onto the show?

Question

Quizplus · Accepted Answer

The Answer is Three standard deviations above the mean is a z score of 3. In Appendix A, the box on the second page shows that when the z score is three, the area probability of getting a value between that z score and infinity is .001350, or .135 percent.

Suppose That on a Talent Show Like American Idol, the Only