When flipping a coin, what is the probability that it will land on tails four times in a r

In the second example, when the cardboard is flicked away, the coin will ______

A．drop into the jar

B．cover the mouth

C．stay on the cupboard

D．move into your hand

In the second example, when the cardboard is flicked away, the coin will ______.

A．drop into the jar

B．cover the mouth

C．stay on the cupboard

D．move into your hand

nder strict monitoring.

A coin is flipped twice. Let Y =number of heads obtained, when the probability of a head for a flip equals π. a. Assuming π =0.50 , specify the probabilities for the possible values for Y, and find the distribution’s mean and standard deviation. b. Find the binomial probabilities for Y when π equals (i) 0.60, (ii) 0.40. c. Suppose you observe y =1 and do not know π. Calculate and sketch the likelihood function. d. Using the plotted likelihood function from (c), show that the ML estimate of π equals 0.50.

give him a present with a sharp edge or point？

A.To specially celebrate his birthday.

B.To express some special meaning which you dare not tell directly.

C.To wish for a long-lasting friendship.

D.To wish your friend good luck in his life.

A、Every coin has two sides.

B、Advantages usually go hand in hand with disadvantages.

C、While discussing the merits of ..., we cannot forget its demerits.

D、While...has so many advantages, we should not ignore the problems it brings us.

Once while trying to reach his car key, Li Ka-shing

dripped a two-dollar coin, which rolled under the ear. 【M1】______.

He figured out when the car started, the coin would fall 【M2】 ______.

into the gutter, so he bent down to pick it up. Seeing

this, an Indian attendant on duty immediately picked it

up for him. Having got back his coin, Li Ka-shing

surprisingly gave the attendant 100 dollars as a reward. His

explanation for such a big reward was: "If the attendant

hadn't picked up the coin, it have rolled into the gutter and 【M3】 ______.

the two dollars would have disappeared from the world.

When I gave 100 dollars to the attendant, he could spend it 【M4】______.

on some useful purpose. I think money should be used, not

wasted."

This incident illustrates Li Ka-shing's philosophy of 【M5】______.

economy. It also exemplify his way of thinking; that is, he 【M6】______.

judges whether an individual's action is justified with

determining whether it increases or decreases the total net

income of society. As long as the total net income of society 【M7】______.

increased, it doesn't matter if he himself suffers a loss;

conversely, if the total net income of society is decreased, 【M8】______.

his own personal financial gain will still be a loss in broad sense.

We shouldn't look down on this way of Considering the 【M9】______.

total net-income of society—it is a big issue concerned the

wealth and strength of the nation. In his book The Wealth of

Nations, Adam Smith expressed an important view: the

contribution individuals make to society in pursuing their 【M10】______.

own good is great than that made by individuals attempting

to benefit society.

【M1】

根据下面内容，回答题：

A few minutes ago， walking back from lunch， I started to cross the street when I heard the sound of a coin dropping. It wasn"t much but， as I turned， my eyes caught the heads of several other people turning too. A woman had dropped what appeared to be a dime.

The tinkling sound of a coin dropping on pavement is an attention-getter. It can be nothing more than a penny.Whatever the coin is， no one ignores the sound of it.It got me thinking about sounds again.

We are besieged（包围） by so many sounds that attract the most attention. People in New York City seldom turn to look when a fire engine， a police car or an ambulance comes screaming along the street.

When I"m in New York， I"m a New Yorker. I don"t turn either. Like the natives.

At home in my little town in Connecticut， it"s different. The distant wail of a police car， an emergency vehicle or a fire siren brings me to my feet if I"m seated and brings me to the window if I"m in bed.

It"s the quietest sounds that have most effect on us， not the loudest. In the middle of the night， I can hear a dripping tap a hundred yards away through three closed doors.I"ve been hearing little creaking noises and sounds which my imagination turns into footsteps in the middle of the night for twenty-five years in our house. How come I never hear those sounds in the daytime？

The sound of a coin dropping makes people________. 查看材料

A.think of money

B.look at each other

C.pay attention to it

D.stop crossing the street

Section B

Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.

A few minutes ago, walking back from lunch, I started to cross the street when I heard the sound of a coin dropping. It wasn't much but, as I turned, my eyes caught the heads of several other people turning too. A woman had dropped what appeared to be a dime.

The tinkling sound of a coin dropping on pavement is an attention-getter. It can be nothing more than a penny. Whatever the coin is, no one ignores the sound of it. It got me thinking about sounds again.

We are besieged (包围) by so many sounds that attract the most attention. People in New York City seldom turn to look when a fire engine, a police car or an ambulance comes screaming along the street. When I'm in New York, I'm a New Yorker. I don't turn either. Like the natives, I hardly hear a siren (警报器) there.

At home in my little town in Connecticut, it's different. The distant wail of a police car, an emergency vehicle or a fire siren brings me to my feet if I'm seated and brings me to the window if I'm in bed.

It's the quietest sounds that have most effect on us, not the loudest. In the middle of the night, I can hear a dripping tap a hundred yards away through three closed doors. I've been hearing little creaking noises and sounds which my imagination turns into footsteps in the middle of the night for twenty-five years in our house. How come I never hear those sounds in the daytime.'？

I'm quite clear in my mind what the good sounds are and what the bad sounds are. I've turned against whistling, for instance. I used to think of it as the mark of a happy worker but lately I've been associating the whistler with a nervous person making compulsive noises. The tapping, tapping, tapping of my typewriter as the keys hit the paper is a lovely sound to me. I often like the sound of what I write better than the looks of it.

The sound of a coin dropping makes people ______.

A．stop crossing the street

B．look at each other

C．pay attention to it

D．think of money

ones lying？ The answer is, theyre probably not. Traditional economics says that people are【C2】______ beings who will lie if its【C3】______their advantage. A recent university study has shown that, actually, were pretty honest— especially when were at home. Researchers in Germany phoned people at home and asked them to【C4】______a coin. There was a strong financial【C5】______to fake the result: if the coin landed tails-up, the participant would receive money or a gift【C6】______, while if the coin landed heads-up, they would get nothing. Because they were on the phone, they knew there was no【C7】______of getting caught if they lied. And yet people revealed the truth【C8】______they would receive nothing. Over hundreds of tosses a coin will land tails-up【C9】______50% of the time. In this study over half the people(55. 6%)asked said that the coin landed heads-up. Most of diem didnt pursue the reward at the【C10】______of honesty. Previous studies had found mat people were more【C11】______. In those laboratory studies 75% of people,【C12】______some who faked the results, reported a winning coin and claimed a reward. So me research team【C13】______ its being in our own home which makes us play fair.【C14】______, what motivates people to do so remains【C15】______. In fact, both types of study show people are surprisingly【C16】______. Even in me laboratory, 25% of people【C17】______a reward by telling the truth. The researchers say this is because honesty is highly valued and people deem honesty is me【C18】______for doing everything well. We care about our reputation and our sense of ourselves as【C19】______people. So lying has a psychological cost and it seems mis cost【C20】______ the financial benefits of lying.

【C1】

A．conceive

B．deceive

C．conceit

D．perceive