Which probability distribution is applied when the probabili..

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第1题

The sea is very big. Look at a map of the world. There is less land than sea. The sea covers three quarters of the world.

The sea is very deep in some places. There is one spot, near Japan, where the sea is nearly 11 kilometres deep. The highest mountain in the world is about 9 kilometres high. If that mountain were put into the sea at that place, there would be 2 kilometres of water above it.

If you have swum in the sea,you know that it is salty. You can taste the salt. Rivers,which flow into the sea, carry salt from the land into the sea. Some parts of the sea are less salty than other parts. There is one sea, called the Dead Sea, which is very salty. Because it is very salty, swimmers cannot sink! Fish cannot live in the Dead Sea.

In most parts of the sea, there are plenty of fishes and plants. Some live near the top of the sea.Others live deep down. There are also millions of tiny living things that float in the sea. These floating things are very small. It is hard to see them. Many fish live by eating them.

The sea can be very cold. Divers, who dive deep down in the sea, know this. On the top thewater may be warm. When the diver goes downwards, the sea becomes colder and colder.

Another thing happens. When the diver goes deeper, the water above presses down on him. It’ squeezes him. Then the diver has to wear clothes made of metal. One spot of the sea near Japan is____.

A.nearly nine kilometres deep

B.almost eleven kilometres high

C.two kilometres above the highest mountain in the world

D.two kilometres deeper than the height of the world, s highest mountain

Which of the following is NOT true？A.Fish cannot live in the salty sea

B.The sea gets its salt from rivers

C.Different parts of the sea have different amount of salt

D.There is no fish in the Dead Sea

Fish in the sea live____.A.near the top of the sea

B.deep down in the sea

C.at different depth of the sea

D.on tiny living things in the sea

The deeper divers goes down in the sea,____.A.the warmer the sea becomes

B.the colder they find the sea is

C.the less the water above presses down

D.the heavier their clothes must be

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第2题

听力原文：What did people send to the victims of the flood？

What did people send to the victims of the flood？

They sent money and ______ to the victims.

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第3题

Iron tools and the coupling-plough were brought into use for the first time in Sang Dynasty.

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第4题

完形填空。????Most of us can remember the days when...

完形填空。

Most of us can remember the days when we didn't use e-mail as an everyday vehicle for communication.

Slowly but surely, it crept (慢慢移动) into1. E-mail is a2tool for college students at any level. It's

available 24 hours a day,7 days a week and3at holidays. Most universities assign students an account

entrance,4there is usually not even an option (选择) involved.

You can do everything from consulting on homework and projects,5classmates, family and friends,

and getting daily new services to6you informed of world7. But, what are the8？ E-mail can be e-jail.

You might9hours writing and replying to e-mails10you should be busy with the books for an upcoming

exam.

11,you might be signed up for so many daily services,12horoscopes (占星术), new services, or

personals, that your mailbox is so13"junk mail",that finding the14e-mails through your box might take

hours.

If you're a student,15is precious. Create and organize your e-mail folders into important school-related

mail, correspondence (通信)with friends and family, and a folder for jokes, horoscopes and other new services.

16put the mail into the proper folders first, and when you've finished, head for the important school-related

folder first. Respond to the most important e-mails first and,17you have time, you can get to the others.

18your friends from forwarding those tiresome jokes, tiresome quizzes, and chain mails. The minute you

19you've got one, delete it20so you won't be tempted to read it.

( )1. A. the lives

( )2. A. valuable

( )3. A. even

( )4. A. but

( )5. A. keeping touch with

( )6. A.keeping

( )7. A. accidents

( )8. A. advantages takes

( )9. A. spend

( )10. A. for

( )11. A. Otherwise

( )12. A. such as

( )13. A. full up with

( )14. A. important

( )15. A.money

( )16. A.Sometimes

( )17. A. if

( )18. A. Encourage

( )19. A.examine

( )20. A.later

B. life

B. changeable

B. still

B. so

B. getting touched to

B. keep

B. incidents

B. mistakes

B. cost

B. because

B. Or

B. such like

B. full

B. necessary

B. mark

B. Always

B. although

B. Watch

B. check up

B. immediately

C. our lives

C. favorable

C. ever

C. because

C. losing touch with

C. leaving

C. events

C. wrongs

C. take

C. since

C. But

C. for example

C. filled up with

C. practical

C. grade

C. Almost

C. since

C. Discourage

C. find

C. after

D. us life

D. usable

D. yet

D. except that

D. keeping in touch with

D. leave

D. things

D. disadvantages

D. pay

D. when

D. However

D. so as

D. fill with

D. possible

D. time

D. Usually

D. because

D. Refuse

D. realize

D. soon

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第5题

The crowd fled in all directions________when they saw the monster.

[ ]

A. in hurry

B. in panic

C. without doubt

D. beyond wonder

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第6题

In a continuous probability distribution, the random variable:

A、is limited to certain values.

B、may be any value within a certain range.

C、may have a probability greater than 1.00.

D、is discrete.

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第7题

In general, a discrete probability distribution requires that:

A、all outcomes must have the same probability of success.

B、the probabilities for all possible outcomes must sum to 1.00.

C、the probability of success must be less than 0.1.

D、the events must be dependent.

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第8题

For any probability distribution, the expected value is:

A、equal to the random variable.

B、equal to the mean of the distribution.

C、equal to the variance of the distribution.

D、cannot be greater than 1.

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第9题

For a binomial distribution with n = 15, as π changes from 0.05 toward 0.50, the distribution will become:

A、more positively skewed.

B、more negatively skewed.

C、symmetrical.

D、rectangular.

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第10题

The variance of a binomial probability distribution with n = 10 and π = .95 is:

A、9.50.

B、0.475.

C、100.0.

D、0.9025.

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Which probability distribution is applied when the probability of a success is very small？