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一、数据集中和变异特征 1. 下表为甲桃树各 10 个单株的产量(单位:千克),试分别用 EXCEL 计算它们各自的平均值、极差、方差、标准差和变异系数(结果均保留三位小数)。 品种 1 2 3 4 5 6 7 8 9 10 甲 42 36.2 45 34.8 38.7 39 40.6 38.8 38.3 43.3 乙 48.8 38.1 44.8 36.2 35.7 47.4 35.8 48.1 45.7 46 甲 组桃树单株产量: 平均值 = ,极差 = ,方差 = ,标准差 = ,变异系数 = 。 乙组桃树单株产量: 平均值 = ,极差 = ,方差 = ,标准差 = ,变异系数 = 。 甲桃树单株产量变异程度比较,甲组 乙组。 (横线填大于、等于或小于)
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【单选题】Don't worry. There's still ________ time to go.
A.
little
B.
a little
C.
few
D.
a few
【单选题】– It’s that seat taken? -__________.
A.
Please don’t worry.
B.
I don’t think so.
C.
Why not?
D.
It’s very nice.
【单选题】Xiaodong ______ goes to school by bike. She walks to school.
A.
always
B.
often
C.
sometimes
D.
never
【单选题】— John, don’t waste any time and there’s only 25 minutes left before the train leaves. — Don’t worry, mum. I think I can ______ it.
A.
manage
B.
make
C.
do
D.
achieve
【单选题】-I got an A in Physics. -( ).
A.
Don't worry about it
B.
Congratulations! That's a difficult course
C.
You are very good
D.
Good luck to you!
【单选题】In the evening the General Manager gave a banquet at the International Hotel ______ the foreign guests. [ ]
A.
in honor of
B.
in place of
C.
in face of
D.
in favor of
【单选题】In the evening the car broke down suddenly and the heavy rain the helplessness of the girl driver on the country road.
A.
resulted from
B.
made up
C.
turned out
D.
added to
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