Over 7 days, the number of requests received each day is 810, 790, 830, 823, 780, 795, 820
On exactly 4 out of the 7 days that week, there was at least one request that was not addressed.
On the following Monday, the site received 812 requests.
We need to find the Minimum and the Maximum number of requests that could have been not addressed on that Monday
Lets arrange the requests in ascending order
=> 780, 790, 795, 810, 820, 823, 830
Given that on exactly 4 days, the requests exceeded RT, the cutoff is between 795 and 809 inclusive
So,
Maximum RT that still gives exactly 4 days of overload = 809 (810, 820, 823, 830 would still exceed it)
Minimum RT that still gives exactly 4 days of overload = 795 (810, 820, 823, 830 would still exceed it)
So the RT range possible is between 795 to 809
Now we need,
Minimum number of requests that could have been not addressed on that Monday is when RT is maximum
=> RT = 809
=> Minimum unaddressed requests= 812 - 809 = 3
Maximum number of requests that could have been not addressed on that Monday is when RT is minimum
=> RT = 795
=> Maximum unaddressed requests = 812 - 795 = 17
Minimum = 3
Maximum = 17