When do creative people get their best ideas? USA Today did a survey

of 966 inventors (who hold U.S. patents) and obtained the following information.
Time of Day When Best Ideas Occur

Time    Number of Inventors
6 A.M.-12 noon. 300
12 noon-6 P.M. 140
6 P.M.-12 midnight. 329
12 midnight-6 A.M.  197

(a) Assuming that the time interval includes the left limit and all the times up to but not including the right limit, estimate the probability that an inventor has a best idea during each time interval: from 6 A.M. to 12 noon, from 12 noon to 6 P.M., from 6 P.M. to 12 midnight, from 12 midnight to 6 A.M. (Enter your answers to 3 decimal places.)

-6AM-12PM    ?
-12PM-6PM  ?
–   6PM-12AM ?
–  12AM-6AM. ?

(b) Do the probabilities add up to 1? Why should they?
No, because they do not cover the entire sample space.
Yes, because they cover the entire sample space.
Yes, because they do not cover the entire sample space.
No, because they cover the entire sample space.

What is the sample space in this problem?
12AM-12PM
6AM-6PM
6AM-12AM
the entire day

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