Asked by Tim

Each student in a class of 25 students wrote down a random digit. What is the predicted number of students who wrote a digit that is greater than 7?
The answer is 5... How did they get 5?
THANK YOU!!
Answered by Marth
There are 2 digits (8,9) greater than 7. So every student has a 1/5 chance of choosing a digit greater than 7. With 25 students, the expected number that choose a digit greater than 7 is 25/5 = 5.

I would not say the "predicted" number, but rather the "expected" number. The expected value may not always be an outcome.
Answered by Anonymous
How did u come up with 1/5 before u got the answer 5
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