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12. Ben rolls a regular die ten times and adds up the number of dots. How many dots does he expect to get? 13. Let's

12.

Ben rolls a regular die ten times and adds up the number of dots. How many dots does he expect to get?

13.

Let's continue with the above question: Ben's friend, Polly, wants to know what the variance for the number of dots is

going to be (when the die is rolled ten times). What is it?

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