GWD 17-10

[ariesmilla]

Q10:
Was the average (arithmetic mean) weight of the package mailed at a certain post office yesterday greater than 600 grams?
(1) The total weight of the packages mailed at the post office yesterday was greater than 14,500 grams.
(2) Fewer than 25 packages were mailed at the post office yesterday.

為什麼答案是C...??
條件一二單獨不充分，條件1.2合併我覺得也不充分阿...一個greater than 14500grams, 一個是fewer than 25 package..可能的組合很多，怎麼會是C呢? 我選E，請各位大大幫我看一下，叩謝~~~

[pamelatsai]

(1)+(2)
14500/24=604
最小是604>600
其他比14500gram更多或比24個package更少~都會超過600 gram越來越多
所以答案是(C)

[chris8888]

恩, 有些題目不能只用看的, 要算一算, 比較踏實