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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Billy wants to determine the average number of cookies in a package of cookies. He purchases 7 packages of cookies, opens them, and counts the number of cookies in each one. He finds that the packages have 8, 10, 12, 15, 16, 17, and 20 cookies. Based on these observations, what is the average number of cookies in a package?

(Note: the average of a list of numbers is the sum of the numbers divided by how many numbers there are.)
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
14
Billy wants to determine the average number of cookies in a package of cookies. He purchases 7 packages of cookies, opens them, and counts the number of cookies in each one. He finds that the packages have 8, 10, 12, 15, 16, 17, and 20 cookies. Based on these observations, what is the average number of cookies in a package?

(Note: the average of a list of numbers is the sum of the numbers divided by how many numbers there are.)
train