When do creative people get their Good Ideas? Assume that the survey of 962 inventors gives the following

When do creative people get their Good Ideas? Assume that the survey of 962 inventors gives the following information:
Time of Day When Good Ideas Occur
Time: Number of Inventors
6 A.M - 12 noon 289
12 noon - 6 P.M. 135
6 P.M - 12 Midnight 318
12 Midnight - 6 A.M. 220
Assume that the time interval includes the left limit and all the times up to but not including the right limit.
The probablility that an investor has a good idea during the time interval from 6 A.M. to 12 noon is 289/962 and
probability that an investor has a good idea during the time interval from midnight to 6 A.M. is 110/481. Estimate
the probability that an inventor has a good idea during both the time intervals from 6 A.M. to 12 noon and from midnight to 6 A.M.
Write your answer as a fraction in simplest form.
a) 1/2
b) 15895/231361
c) 509/962
d) 1/4
e) none of these choices