在△ABC中，点D在边BC上，且DC=2BD，AB：AD：AC=3：k：1，则实数k的取值范围为____ 

Dear Lucy,
   We are back in Garden City now. We had    1   good trip.
   I    2  to collect my photos yesterday. They    3great! I showed these photos    4  my classmates. They all   5  them.
   There is a photo of Ben and Simon  6   the Great Wall. There is one of you and  7in the Forbidden City(紫禁城).
We really enjoyed    8vacation. We were sad(悲伤)to   9   you.
   You must   10and visit us in Garden City at Chinese New Year.
                                                                                                                                                          Love,
                                                                                                                                                          Kitty

一组数据2，3，1，2，2的中位数、众数和方差分别是（　　）