What is the average (arithmetic mean) of 330, 360, and 390?

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问题 What is the average (arithmetic mean) of 330, 360, and 390?

选项 A、360
B、3177
C、310 + 320 + 330
D、327 + 357 + 387
E、329 + 359 + 389

答案E

解析

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