问题
单项选择题
离散趋势就是指一组数据间的离散程度，其最常用的统计量就是（），它是一组数据中各数值与算术平均值相减之差的平方和的算术平均数的平方根。
A.众数
B.标准差
C.方差
D.中位数
答案
参考答案：B
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离散趋势就是指一组数据间的离散程度，其最常用的统计量就是（），它是一组数据中各数值与算术平均值相减之差的平方和的算术平均数的平方根。
A.众数
B.标准差
C.方差
D.中位数
参考答案：B
A young man was getting ready to graduate（毕业）from college. For many months he had admired（欣赏，羡慕） a beautiful sports car in a seller's showroom, and knowing his father could it, he told him that was all he wanted. On the morning of his graduation day his father called him into his own study and told him how he was to have such a fine son. He handed his son a beautiful gift box. but slightly（轻微地） disappointed, the young man opened the box and found a lovely book. ,he raised his voice at his father and said, "With all your money you only give me a book?" Then he rushed out of the house, the book in the study. He didn't contact（联系） his father for a whole year one day he saw an old man who looked like his father in the street. He realized he had to go back home and see his father. When he arrived at his father's house, he was told his father had been in hospital for a week. When he was going to the hospital, he saw the new book still on the desk, just as he had left it one before. He opened it and began to turn the pages. Suddenly, a car key _____ from an envelope(信封) behind the book. It had a tag（标签）.On the tag was the of his graduation, and the words PAID IN FULL.
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