阅读下列短文，按要求完成各题。

    Tony is from New York. His father has a store there. And his mother is a reporter. He's six years old now and begins to go to school this year. It's very near their shop and his father doesn't drive a car to take him to school. He walks to school early every day. So he's not late for class and his teachers like him.

    It's Tuesday today. Miss White is teaching them to count from one to ten. Tony is studying hard. Soon he can count them. Miss White is happy and asks, "How many people are there in your family, Tony?"

    Tony stands up and begin to count with his fingers, and then says, "Two, Miss White."

    "Who are they?"

    "My father and my mother."

    "Oh?" Miss White is surprised, "Two people in your family?"

    "Because now I'm not at home."

下列现象中，不能说明分子在运动的是（   ）

从某小区抽取100户居民进行月用电量调查，发现其用电量都在50至350度之间，频率分布直方图如图所示：

（Ⅰ）直方图中x的值为____；

（Ⅱ）在这些用户中，用电量落在区间100，250）内的户数为____．