Averaging entries per day by date.

Can someone tell me what the best way to average entries per day, by date is? I just want to know how many entries per day on average.
Also, If it's not too much more, i may need the ability to to average entries per day by person. So if the dates are in A column, and in B column is the person inputting the data, can i average per day by user also?

Thanks a lot!

See Sample data below.