问题
填空题
在一个样本中，40个数据分别落在4个组内，已知第一、二、四组数据个数分别为5，12，8，则第三组的频数为 ．
答案
15
解：由题意得，第三组的频数为
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在一个样本中，40个数据分别落在4个组内，已知第一、二、四组数据个数分别为5，12，8，则第三组的频数为 ．
15
解：由题意得，第三组的频数为
I 1 you’re well. I’m 2 holiday in London with my friend Jenny. We arrived 3 plane last Monday and 4 a taxi to our hotel. I went for a walk in Hyde Park but Jenny 5 with me 6 she was tired. Then 7 Tuesday we saw the clock, Big Ben, and BuckinghamPalace. Queen Elizabeth lives in the palace, but we didn’t see her. I 8 some presents. 9 day we visited the BritishMuseum 10 had dinner in a Chinese restaurant.
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