Suppose we want a 90% confidence interval for the average amount of time (in minutes) spent per week on homework by the students in a large introductory statistics course at a large university.The interval is to have a margin of error of 5 minutes, and the amount spent has a Normal distribution with apopulationstandard deviation= 39.9 minutes.The number of observations required is closest to

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231.

132.

199

173.

151.