Posted by freddo on .
Hi,
Can someone check this for me please..
18 MB of data are to be transmitted over a 4 megabits per second connection. How long should the complete transaction take, to the nearest 0.1s.
Size of file / data rate so,
18MB x 10^6 x 8 bits = 144,000,00
4 megabits per second = 4 x 10^6 = 4,000,000 bits per second
so the download time will be
144,000,000 / 4,000,000 = 36 seconds
my answer is 36 seconds is that right
next ,....
a 50 MB file compressed using a ratio of 10 what is the compressed file size
50MB / 10 = 5 MB
Is this correct ???
Thank you :0)

IT Data transmission 
bobpursley,
on the first, yes, maybe. Normally data streams have error correcting codes built in that actully take up "useful" information space.
yes on the second.