
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Billy wants to determine the average number of cookies in a package of cookies, considering some cookies may be defective and should not be counted. He purchases 8 packages of cookies, opens them, and counts the number of non-defective cookies in each one. He finds that the packages have 9, 11, 13, 16, 17, 18, 21, and 22 non-defective cookies. What is the average number of non-defective cookies in a package?

Present the answer in LaTex format: \boxed{Your answer}
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