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baud rate is the rate of symbol changes...symbol can be of 1 bit, 2 bit , 3 bit etc.... Where as frequency is the inverse of rate of lowest unit in a digital transimission...
Both are units of data transmission rates through a communication medium. Baud rate signifies symbol rate. How many symbol changes are transmitted per second. Symbols can contain one bit or more (e.g. 3-bit symbols). Bit is smallest unit in digital transmission or digital communication. Bit has only two states but symbols can have more than 2 states. So symbol may may represent more than one binary bit and so baud rate may or may not be equal to bit rate. Also see http://en.wikipedia.org/wiki/Bit_rate http://en.wikipedia.org/wiki/Baud - Neeraj Sharma
The rate of a rate is 100
constant rate means that rate which is fixed and can not be changed. varying rate is that rate which is not fixed and can be change easily.
mortality rate - death rate