问题
填空题
小颖使用计算器求30个数据的平均数时，错将其中一个数据15输入为105，那么由此求出的平均数与实际平均数的差是______．
答案
由题意知，错将其中一个数据15输入为105，则多加了105-15=90，所以平均数多了90÷30=3．
故填3．
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小颖使用计算器求30个数据的平均数时，错将其中一个数据15输入为105，那么由此求出的平均数与实际平均数的差是______．
由题意知，错将其中一个数据15输入为105，则多加了105-15=90，所以平均数多了90÷30=3．
故填3．
| 完形填空。 | ||||
| Today is Sunday. Mary and her mother 1 to do the shopping. Her mother wants to buy something for supper. Mary wants to buy a new skirt and some school things. They come to a new shop. "What does your shop sell?" Mary asks."A lot of things," 2 in the shop says."You can buy food, drinks, clothes in our shop and school things, too." Mary and her mother go in. There are many people in the shop. Mary wants a skirt. " 3 do you want?" asks the girl in the shop. "White." "Have a look 4 this one. It's nice." "How much is the skirt?" " 5 eighty yuan." "That's too expensive. Can I find a cheap one?" "What about the green one? It 6 nice. And it's 7 thirty yuan. "OK, 8 a lot." "You are welcome." After that, Mary buys some school things, too. 9 mother buys a lot of food, like bread, cakes, meat and fish. 10 get home very late. | ||||
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