When Do Creative People Get Their Good Ideas? Assume That

When do creative people get their good ideas? Assume that the survey of 965 inventors gives the following information: 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 good idea during the time interval from 6 P.M. to midnight. Write your answer as a fraction in simplest form.
$$\begin{array}{l}\text { Time of Day When Good Ideas Occur }\\\begin{array} { l c } { \text { Time } } & \begin{array} { c } \text { Number of } \\\text { Inventors }\end{array} \\6 \text { A.M. } - 12 \text { noon } & 284 \\12 \text { noon } - 6 \text { P.M. } & 133 \\6 \text { P.M. } - 12 \text { midnight } & 325 \\12 \text { midnight } - 6 \text { A.M. } & 223\end{array}\end{array}$$

A) $\frac { 1 } { 2 }$
B) $\frac { 1 } { 4 }$
C) $\frac { 65 } { 193 }$
D) $\frac { 65 } { 128 }$
E) none of these choices