Question: Please help with computations and explanations for this probability problem: Test-preparation organizations like Kaplan, Princeton Review, etc. often advertise their services by claiming that students

Please help with computations and explanations for this probability problem:

Test-preparation organizations like Kaplan, Princeton Review, etc. often advertise their services by claiming that students gain an average of 100 or more points on the Scholastic Achievement Test (SAT). Do you think that taking one of those classes would give a test taker 100 extra points? Why might an average of 100 points be a biased estimate?

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