问题
单项选择题 A1/A2型题
何种分布的资料，均数等于中位数（）。
A.对称分布
B.对数正态分布
C.左偏态
D.右偏态
E.二项分布
答案
参考答案：A
解析：本题考点是资料分布特征。中位数适宜描述各种分布资料，但是对于偏态分布资料集中趋势宜用中位数描述，而当资料为对称分布时，均数与中位数相等。
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何种分布的资料，均数等于中位数（）。
A.对称分布
B.对数正态分布
C.左偏态
D.右偏态
E.二项分布
参考答案：A
解析：本题考点是资料分布特征。中位数适宜描述各种分布资料，但是对于偏态分布资料集中趋势宜用中位数描述，而当资料为对称分布时，均数与中位数相等。
Life is like potato salad; when it’s shared it becomes a picnic. When my three children were young, my husband Roy and I were very 小题1: . “Can we go on a picnic, Mom?” my six-year-old daughter, Becky 小题2: . “Please.” I had said no so many times in 小题3: months, and I decided the usual Saturday morning chores (日常工作) could 小题4: . To her 小题5: I agreed. I prepared a few sandwiches and 小题6: a cooler with ice and drinks and called Roy 小题7: . My eleven-year-old twin sons loaded the cooler and the picnic basket in the trunk and off we went to spend some 小题8: time together as a family. About the time I got the lunch 小题9: out on the table, Roy arrived on the 小题10: . That was one of the happiest meals we ever shared together. The meal was filled with 小题11: . We felt a closeness that had been hidden by work and school related responsibilities for so many months. Roy and the boys 小题12: rocks into the lake. Becky fed the ducks and I sat quietly at the picnic table, 小题13: God for blessing me with such a wonderful family. That night as our children went to bed, I kissed their cheeks and 小题14: what a wonderful life I had. As I walked out of the room it dawned on me that even the busiest 小题15: could become a picnic when it’s shared with the ones you 小题16: . Even though the kids have now grown up and 小题17: from home, I can still remember how I felt that day while sitting at the picnic table. Maybe today would be a good time to 小题18: potato salad, call all of my 小题19: kids, feed some hungry ducks and skip a few rocks into the lake. Since life is like potato salad, let’s make it a 小题20: .
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