# The U.S. mint, which produces billions of coins annually

March 29, 2017

Question
Question 10
The U.S. mint, which produces billions of coins annually, has a mean
daily defect rate of 4 coins. Let X be the number of defective coins
produced on a given day.
What is the variance of this distribution?

Question 11
The U.S. mint, which produces billions of coins annually, has a mean
daily defect rate of 4 coins. Let X be the number of defective coins
produced on a given day.
On a given day, what is the probability of exactly 4 defective coins?

Question 12
The U.S. mint, which produces billions of coins annually, has a mean
daily defect rate of 4 coins. Let X be the number of defective coins
produced on a given day.
On a given day, what is the probability of 3 or fewer defective coins?

Question 13
The U.S. mint, which produces billions of coins annually, has a mean
daily defect rate of 4 coins. Let X be the number of defective coins
produced on a given day.
On a given day, what is the probability of more than 3 defective
coins?

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