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# diana

Questions20
• ### opinons on the tv show one tree hill?

1 AnswerPolls & Surveys4 weeks ago
• ### MATH HELP?

Discrete random variable X has mean and variance V(X) = 2. Discrete random variable Y is found using the formula Y = 2X + 35. Find V(Y)

• ### opinions on the tv show Gossip Girl?

5 AnswersPolls & Surveys2 months ago
• ### opinons on the show Pretty Little liars?

3 AnswersPolls & Surveys4 months ago
• ### Math help? I did the question I'm just wondering how you get 0.0796?

A fair coin is tossed 100 times. Let X be the number of times heads comes up. Find Pr[X = 50].

• ### Math help??? Im just wondering how do you get 47?

If X and Y are independent random variables with V(X) = 2 and V(Y) = 5, find V(-X + 3Y).

• • ### math help? I did the question and I'm just wondering why 2/5 is the answer?

X is a discrete random variable with Pr[x=0]=1/5 and Pr[x=1]=4/5. What is the standard deviation?

• ### Math help?

A certain experiment has 2 possible outcomes, t1 and t2. These outcomes are equally likely to occur when the experiment is performed. These are 2 discrete random variables defined for this experiment, X and Y. When outcome t1 occurs, X has the value 0 and Y has the value -2. When outcome t2 occurs, X has the value 1 and Y has the value 2. All of this information is summarized in the table shown below. Find the standard deviation of (X+Y)

outcome probability x Y

t1 1/2 0 -2

t2 1/2 1 2

• ### Math help?

If Y = 2X - 1 and V(X) = 9, what is the standard deviation of Y?

• ### math help?

A pair of dice is to be tossed 18 times. What is the expected number of times in the 18 tosses that the sum of the numbers on the dice will be 5?

• ### math help?

Only 10% of the computer chips produced by an experimental process are good. If 15 chips are made, what is the probability that exactly two are good?

• ### math help?

A soccer team named the Victorious Lunatics will play 6 games in UWO league play this season. In each game that the team plays, they are twice as likely to win as to tie (i.e. have the game end in a draw), and twice as likely to tie as to lose. What is the probability that the Victorious Lunatics will end the season with 4 wins, 1 tie and 1 loss?

• ### math help?

A box contains 3 red chips, 2 blue chips and 5 white chips. Eight chips are drawn at random from the box one at a time with replacement. That is, each chip is put back in the box before the next one is drawn. All chips are identical except for colour. What is the probability that exactly 5 of the drawn chips are blue?

• ### Math help?

Let X be the number of times heads comes up when a fair coin is tossed 30 times. Which one of the following statements is false?

A. X is a Binomial random variable

B. The possible values of X are the integers from 0 to 30 inclusive.

C. If Y=30 - X then Y=B(30, 1/2) counts the number of times tails comes up.

D. The various possible values of X are equally likely to occur.

E.    PR[X=K]=(30/K][1/2]^30

• ### Math help?

A single card is drawn from a well-shuffled deck. This experiment is performed 5 times. (The card is replaced and the deck is shuffled between repetitions of the experiment.) What is the probability that at least one club is drawn?

• ### Math help?

A box contains 3 red chips, 2 blue chips and 5 white chips. Eight chips are drawn at random from the box one at a time with replacement. That is each chip is put back in the box before the next one is drawn. What is the probability that exactly 5 of the drawn chips are blue and exactly 1 is white?

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