In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question "Have you ever used cocaine?" in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this survey of 2400 students. Suppose one subject is randomly selected from this group. Find the probability that the subject answered "No." Show this answer as a fraction. Do not attempt to reduce the fraction.

Survey Method NO YES TOTAL
Anonymous 576 224 800
Personal 600 200 800
Phone 632 168 800
Total 1808 592 2400

Is the answer 1808/2400?

Yes.

Yes, the answer is indeed 1808/2400.

To find the probability that the subject answered "No," you need to calculate the proportion of subjects who answered "No" out of the total number of subjects in the survey.

The total number of subjects in the survey is given as 2400. From the contingency table, you can see that the number of subjects who answered "No" is 1808.

So, the probability of a subject answering "No" is calculated as:

Probability of "No" = Number of subjects who answered "No" / Total number of subjects
= 1808 / 2400
= 1808/2400

Therefore, the answer is indeed 1808/2400.