[計量] 一題計量機經請教，謝謝!!
In a neighborhood consisting of 2,000 homes, 80 percent of the homes
are valued at $325,000 or less. Which of the following statements
about the values of the homes in the neighborhood must be true?
Indicate all such statements.
A. The average (arithmetic mean) value is at most $325,000.
B. The median value is at most $325,000.
C. At most 400 homes have values greater than $325,000.
答案: BC。想請教B怎麼算出來??謝謝!!
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