SOLUTION: The probability of a table-tennis ball being defective is 1/10. About how many balls would be defective in a case of 725 table-tennis balls?

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Question 971525: The probability of a table-tennis ball being defective is 1/10. About how many balls would be defective in a case of 725 table-tennis balls?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
I would expect 1/10 or 73 (rounded)
Expected value is probability * the number.