Emad Taha Dec 10, 2018:

Not at all ☺

Rasha Mohamed (asker) Dec 10, 2018:

Thank you Mr. Emad Taha

Emad Taha Dec 10, 2018:

You are right, however one sense is "the part that is between the beginning and the end of a period of time or an event"
Reference: Macmillan English Dictionary

Rasha Mohamed (asker) Dec 10, 2018:

I also thought it is a typo but if middle should it be from 15 and the example is 09?

Emad Taha Dec 10, 2018:

It is a misprint. The correct word is middle, mid.