Bob

A certain typing agency employs two typists. The average number of errors per article is 3.8 when typed by the first typist and 2.3 when typed by the second. If your article is equally likely to be typed by either typist, find the probability that it will have no errors.

I understand 3.8(.5) + 2.3(.5) for Expected value, but how do I determine probability of zero errors?

A certain typing agency employs two typists. The average number of errors per article is 3.8 when typed by the first typist and 2.3 when typed by the second. If your article is equally likely to be typed by either typist, find the probability that it will have no errors.

So I get how each is .5 probability of getting either typist.

So that's E(x) of 3.8 (.5) + 2.3(.5).

But how do I find the probability of 0 errors?

An airline company is considering a new policy of booking as many as 301 persons on an airplane that can seat only 290. (Past studies have revealed that only 89% of the booked passengers actually arrive for the flight.)

I figured out that the mean is .89 * 301

I figured out the standard deviation is sqrt(.89 * 301 * .11)

Estimate the probability that if the company books 301 persons, not enough seats will be available.

I figure that (mean - 301)/(std) would give how many standard deviations away it is, and then what do I do with that number?

Can someone help me find the probability?

100 numbers are rounded off to the nearest integer and then summed. Suppose the individual round-off error are uniformly distributed over (-.5, .5).

Remember a random variable that follows a uniform distribution over (a,b) has a mean of (a+b)/2, and variance of (1/12)(b-a)^2.

What is the mean of the round-off error of one number? 0 is the answer

What is the standard deviation of the round-off error of one number? I need help with this one.

Suppose the sum of the round-off errors is Y.

What is the mean of Y? 0 is the answer

What is the standard deviation of Y? I need help with this one.

To compute the probability that the resultant sum of the 100 numbers differs from the exact sum by more than 3, we find the two tails on the distribution of Y.

What is the z-score at Y=3 ? . 3/sqrt(100/12) is the answer

What is the probability that the rounded sum is larger than the exact sum by more than 3 ? I need help with this one.

What is the probability that the rounded sum differs from the exact sum by more than 3 ? I need help with this one.

A noted psychic was tested for extrasensory perception. The psychic was presented with 200 cards face down and asked to determine if the card were one of five symbols. The psychic was correct in 50 cases. Let p represent the probability that the psychic correctly identifies the symbol on the card in a random trial. Assume the 200 trials can be treated as a simple random sample.

Suppose you wished to see if there were evidence that the psychic is doing better than just guessing. To do this, you test the hypotheses H_0 : p = .20 versus H_{alternative} : p > .20.

What is the Z score?

What is the p-value for the test statistic? (You can use Q function in the answer)

What is the proper way to phrase this?

"When you think in paradoxes,

When you understand that nothing makes sense,

Everything makes sense. "

Should I use

When you think in paradoxes;

When you understand that nothing makes sense; Everything makes sense.

sorry, idk

thanks, should be an easy 10 points.

We have a pretty awk relationship

but people say we are cute

http://imgur.com/Ooo6i,3S6aZ

People tell me I'm whipped? What do I do?

I like it though

http://imgur.com/kMr3L,uLD9O,aImI3,71NQV#2

rate please :D

We are destined to be.

<3

http://imgur.com/ifCL1,FcMiP,v5OaF#0

http://imgur.com/ifCL1,FcMiP,v5OaF#1

http://imgur.com/ifCL1,FcMiP,v5OaF#2

:D please rate

1-10

(this isn't me)

hehe :)

PVA as in "Youtube PVA Accounts?"

Just curious, Thanks!

I used to be fine, but now it won't let me play them

it just has that buffering circle thing forever

I use google chrome

Again previously I could view them :( now I can't

does anyone have this problem or know how to fix it?

:/

In terms of physical attraction

Would you prefer a really handsome face and average body (not fat, but not much muscle...)

Or an average face with an amazing body?

What are some good scholarship opportunities for a soon to be freshman in college?

And good sites that have lists?

thanks everyone!

The guy in the Captain America trailer

Just wanna know if girls think he is attractive :P

http://www.youtube.com/watch?v=-J3HfllvXWE

is the trailer, or you can google his name

thanks :D

I guess like, what are things guys do that girls find really attractive

just in general, and also when they are horny?

http://www.youtube.com/watch?v=9RUSRxTpI80

Chris Brown - Deuces

The girl's shirt, what type is it/what is it called?

It's like loose and yeah, thanks :)

Yep, from reading what people seem to say

I should tell this girl that I like her

She is my friend, and even if she doesn't like me - that is fine, but like I hope we can be friends

but like how would I tell her/in what way is the best way to tell her

Please like write it out, as if you were recieving it (girls) / telling her (guys)

Just like...what do I say, and in what way...

thanks everyone :)

I like

XV

Lupe

Old Kid Cudi

Immortal Technique

Chiddy

Dean's List

Other artists

Mac and JCole are fine - but please name songs...cuz idk what to listen to from them

Can someone please give me feedback

http://www.kongregate.com/games/ButlerGames/gita-t...

what should I add to this?

Currently I'm thinking about changing the graphics, as they are pretty bad

Also making the poison tower not last forever

I also plan to make cooler creeps, similar to desktop tower defense

but yeah, thanks for input!

Hi guys so the questions is

What are the forces holding each type of crystalline solid together?

Predict which type would have the lowest boiling point. Explain your choice.

Thanks for your help, im pretty sure the first answer is Intermolecular forces, but im not sure about the second answer