That’s ok, I’ve done the ‘rithmatic for you.
Using the laboratory confirmed ebola cases and deaths by my calculations the mortality rate is:
Aug 01 887/1009=87.90%
July 30 826/953 = 86.67%
July 27 729/909 = 80.19%
The numerator in your figures is for ALL suspected cases, and hence incorrect. For example, for August 1, there were 887 deaths for all suspected cases of Ebola. You would need to find the number of deaths corresponding to the subset of cases that were laboratory confirmed, which would be much smaller.
The mortality rate will be low until it is calculated on a specific population for the duration of the infection until the all clear six weeks later. This is because the total infected count is really the “infected-but-not-yet-dead” number due to the lag between detection and final outcome (dead or alive) which takes a few weeks.
IMO a large infected number vs. smaller deaths may actually indicate rapid transmission.