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 .
I find 18, 72% of gender:1 and 28% of gender:2.
Most likely causes
- your are not connected to the appropriate cluster
- you are not using the appropriate database
- you have a typing error in the collection name or field name
Share a screenshot of the steps you took to arrive at your conclusiion.