The probability that an event will NOT happen would be 7/37. It is whatever is left of the remaining total of 37. 37-30= 7.
You can convert 55% into a decimal:
0.55
then you can make it a fraction:
55/100
since we need to simplify it, we aren't done yet. divide both the numerator and denominator by 5(which keeps the fraction equivalent) and you get:
11/20 which is your final answer
