39. There are exactly 5 people in a bookstore at 12:00 p.m. Each person earns an annual income that is between＄30,000 and ＄35,000. No one enters or leaves the bookstore until 12:15 p.m., when a professional athlete with an annual income of more than＄1,000,000 enters the bookstore and joins the other 5 people. The mean, median, range, and standard deviation of the annual incomes of the 5 people in the bookstore at 12:00 p.m. are calculated and compared to the same 4 statistics of the annual incomes of the 6 people in the bookstore at 12:15 p.m. If it can be determined, which of the 4 statistics changed the least?

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

Five similar values, plus a value that far exceeds them, cause the range to become larger, and their averages also become larger. Due to extremes, the variance also becomes larger, and at this time the median is still Between 30000 and 35000, choose C.