简述我国的基本经济制度。结合材料请你谈谈对这一经济制度的认识。

为了了解某班同学的身高情况，随机抽取其中１０位同学，量得他们的身高（单位：ｃｍ）如下　：
148,，150，150，151，152，152，152，153，154，158
这组数据的众数是多少？中位数是多少？平均数是多少？

    Some boys like wearing the same kinds of clothes as girls, and some of them have long hair. So sometimes it's hard to tell whether(是否) they are boys or girls.

    Today is Sunday. I have a walk with my grandmother in the park. My grandmother is 80 years old and she can't see well. After some time, my grandmother is tired(疲倦的), so she sits down on a chair. There is another person sitting on the chair, too.

    “Hello,” my grandmother says to the person with long hair next to her. “Can you see the girl with long hair under the big tree?”“The girl?” says the person, “No, he's my brother Mike.”

    “Oh, sorry. I don't know you are his sister.” Says my grandmother.

    “No, I'm not his sister, I'm his brother!”

甲、乙两位同学在一次用频率估计概率的实验中统计了某一结果出现的频率给出的统计图如图所示，则符合这一结果的实验可能是（　　）