Yes, need to make sure of capital vs lower case designations.
10Mb = 1.25MB / sec. So if you're paying for 10 (max) Mb and getting 768Kb you're doing OK. 768kb would be more like DSL speeds though.
If you're on cable modem, your bandwidth can be affected by what your neighbors are doing on the net. Try it at a few different times of the day for comparison.
it's only an issue for cable if they oversubscribe. Most of the bottleneck is going to be ISP<->Internet and not Home<->ISP.