Answer:
6 hours 57 minutes
Step-by-step explanation:
To find the average, we add up all the numbers and then divide by the toal number of numbers
Add them up
7 hours 12 minutes on Monday,
6 hours 46 minutes on Wednesday,
6 hours 53 minutes on Friday
----------------------------------
19 hours 111 minutes
But there are 60 minutes in 1 hour, so we subtract 60 minutes and add 1 hour
19 hours 111 minutes
+ 1 hour - 60 minutes
---------------------------
20 hours 51 minutes
We added 3 terms together so we divide by 3
20 /3 = 6 2/3 hours
51/3 = 17 minutes
But 2/3 hours needs to be changed to minutes
2/3 * 60 = 40 minutes
6 2/3 hours = 6 hours 40 minutes
Add the hours and minutes together
6 hours 40 minutes
17 minutes
-----------------------------
6 hours 57 minutes
