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Monthly rainfall was recorded for two towns over a five-month period using the chart above. If the median rainfall in Noah’s Lan
Monthly rainfall was recorded for two towns over a five-month period using the chart above. If the median rainfall in Noah’s Lan
admin
2011-01-18
26
问题
Monthly rainfall was recorded for two towns over a five-month period using the chart above. If the median rainfall in Noah’s Landing was equal to the average (arithmetic mean) rainfall in Bellaville, what is the value of x?
选项
A、1
B、8/5
C、2
D、3
E、10
答案
D
解析
Noah’s Landing had a median rainfall of 2 inches, because if we put the numbers in an ordered list (0, 1, 2, 2, 3), the middle number is 2. That means Bellaville had a mean of 2 inches. Since the mean is just the total of the numbers divided by the number of numbers, and there are five numbers in the list, the total of that list must be 10. When we subtract the existing values from 10, we get 10-2-0-4-1=3.
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