皮皮学，免费搜题
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【单选题】
觉新晚上为什么吹箫?A.
因为爷爷
B.
因为
C.
因为梅
D.
因为鸣凤
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】What did the thief take from the shop?
【简答题】用一组样本数据8，x，10，11，9来估计总体的标准差，若该组样本数据的平均数为10，则总体标准差s=______．
【单选题】What is special about the shop's service?
A.
The shop guarantees the battery for a year.
B.
The man will clean it at no extra charge.
C.
The man can repair watches very quickly.
D.
The shop is offering a special discount.
【单选题】—What’s Jack up to in the shoe shop? He’s there for ages. —It’s ______ that he hasn’t decided which pair to buy.
A.
sure
B.
obvious
C.
confusing
D.
curious
【简答题】Describe a shop you like to go to. what shop it is what it sells (or, what you usually buy there) when you first started going to this shop (or, how you came to know about this shop) and explain why y...
【简答题】有一组样本数据8，x，10，11，9，已知它们的平均数为10，则这组数据的方差s 2 ＝ ▲ ．
【简答题】一组样本数据的茎叶图如图所示：则这组数据的平均数等于______．
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