Thanks!

[coderschoolreview]

How many people have the word Chief in their job title?

You should lower the case of "Chief" first to ignore the case status of inner words.

[tuanhung303]

well done! however, try to use pandas features more often instead of loops from python. For example, with orders per hour, you can try below code

data.groupby(['hour'])['Quantity'].count().reset_index().sort_values(by=['hour'])