M001 Chapter 5 at Quiz 2

Hi,
I 'am writing this comment regard to a problem at quiz 2 in the M001 chapter 5.
Actually, there is no Bike rider have a birth year equal to 1999.
Please , verify this problem and correct it .

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I find 18, 72% of gender:1 and 28% of gender:2.

Most likely causes

  1. your are not connected to the appropriate cluster
  2. you are not using the appropriate database
  3. you have a typing error in the collection name or field name

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