已知5个正数a1，a2，a3，a4，a5的平均数是a，且a1＞a2＞a3＞a4＞a5，则数据：a1，a2，a3，0，a4，a5的平均数和中位数是

题干

已知5个正数a₁，a₂，a₃，a₄，a₅的平均数是a，且a₁＞a₂＞a₃＞a₄＞a₅，则数据：a₁，a₂，a₃，0，a₄，a₅的平均数和中位数是（）

A：a，a₃

B：a， $\frac{a_{3} + a_{4}}{2}$

C： $\frac{5}{6}$ a， $\frac{a_{2} + a_{4}}{2}$

D： $\frac{5}{6} a$ ， $\frac{a_{3} + a_{4}}{2}$

上一题下一题 0.0难度选择题更新时间:2017-04-18 01:04:55

答案(点此获取答案解析）

D

同类题1

    A young man was in love with a beautiful girl. One day the girl said to him, “It is my birthday tomorrow.”“ Oh,” said the young man, “I'll send you roses, and one rose for each year of your life.”
     The same evening he went to the flower shop. As he knew the girl was twenty-two years old, he paid for twenty-two roses and asked the shop assistant to send them to the girl the next day. The assistant of the flower shop knew the young man very well as he often bought flowers in his shop before. When the young man left the shop, the assistant thought, “The young man is very kind to me. He often comes to buy my flowers. In return I'll send ten more roses.”
    He did so. The next morning thirty-two roses were sent to the girl. When the young man came to see her, she didn't want to speak to him. And he never knew why she was so angry with him.

题干

答案(点此获取答案解析）

同类题1

同类题2

同类题3

同类题4

同类题5