Given a format: say 12-bit floating point with sign bit, 5 - bit biased exponent and 6- bit significant with implied bit, how do i go about determining the range of values which can be represented. I have tried various times and each time i got a different answer. I'm afraid i'm not quite sure how to approach this problem. 
How to determine the range of a number represented in IEEE-754 format?
floating point;number formats