00:01
Hey there, welcome to numerate.
00:03
We are asked to find a mean number of email that are received a day, given the email's range, the class range, and frequencies.
00:15
So with this, to find the mean, we are basically taking the sum of the frequency times their respective midpoint, which is x, divided by n our sample size.
00:33
So what we know about n is that n equals the sum of the frequencies.
00:52
So if we add up all the frequencies together, we get a cumulative frequency of 174.
01:01
Now for x, we're basically taking the midpoint.
01:05
So for example, we have from 8 to 11, so we take 8 plus 11 divided by 2.
01:13
2 equal in 9 .5...