63 Answered Questions for the topic Probability Stats

Probability Stats

05/10/16

On a game show

Has to do with permutations and combinations   if you're on a game show that has 15 doors, the contestant gets to choose two doors. Behind two of these doors are expensive cars behind the other... more
Probability Stats Stats

05/07/16

Random sample

Suppose a geyser has a mean time between eruptions of 96minutes. If the interval of time between the eruptions is normally distributed with standard deviation 20 minutes, answer the following... more
Probability Stats Probability Distribution

04/30/16

Probability Distribution

The probability distribution for a random variable x is given in the table. find the probability that x≥ 5.   x -10,-5, 0, 5, 10, 15, 20 Probability .20, .15, .05, .1, .25, .1, .15 

If a marble is chosen at random, which of the conditional probabilities is larger, P(red|large) or P(large|red)? URGENT

A jar contains 11 large red marbles, 4 small red marbles, 8 large blue marbles, and 6 small blue marbles. If a marble is chosen at random, which of the conditional probabilities is larger,... more

04/11/16

Probability Question

We have a CDF             {0  if  y< 0 F(y) = {Y^4   if  0<= y <= 1           { 1   if  y>1   The Z transformation is: Z = 3Y^2 + 2,2 ≤ z ≤ 5   My question is: I dont... more
Probability Stats

04/03/16

How large of a sample is required to estimate the mean usage of electricity?

The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. They would like the estimate to have a maximum error of 0.15 kWh. A... more

03/27/16

Probability Question

X has the following pdf   x       p(x) -----|-------  10  |0.40  15  |0.15  17  |0.20  21  |0.15  22  |0.10   a)What is the moment generating function for X b)Use your Moment Generating... more

03/27/16

Probability Question

According to an airline report roughly 1 piece of luggage out of every 200 that are checked are lost. Suppose that a frequently flying businesswoman will be checking 120 bags over the course of the... more

03/23/16

Probability Question

A company has 27 employes. A committee of 4 will be selected. The probability that exactly one woman is selected for the committee is two times the probability that no woman are selected. Calculate... more
Probability Stats

03/21/16

The probability that a randomly selected 1?-year-old male garter snake will live to be 2 years old is 0.745270 ?(a) What is the probability

The probability that a randomly selected 1?-year-old male garter snake will live to be 2 years old is 0.745270. ?(a) What is the probability that two randomly selected 1?-year-old male garter snake... more
Probability Stats

03/21/16

Suppose 34 cars start at a car race. In how many ways can the top 3 cars finish the? race?

This question has to deal with probablity stats. 
Probability Stats Statistics

02/23/16

Statistics Question: 1,000 students were surveyed and asked how many online courses they have taken at UCF.

What is the probability a student has taken at least one online course?# of online courses     # of students         taken                0                125                1                428   ... more
Probability Stats Stats

11/18/15

I dont understand what to do here.

A contractor is considering a sale that promises a profit of $34,000 with a probability of .7 or a loss (due to bad weather and such) of $5,000 with a probability of .3. What is the expected profit?

11/05/15

Z-score Stats question

I have no idea evn how to start this question  The average Demand for renatl skis on winter Saturdays at a particular area is 150 pairs which has been quites stable over time. There is variation... more

10/26/15

Statistics/Probability question

Four balls with different colors: red, yellow, green, and blue, are placed in a box. Every time Amy picks up a ball, then puts it back to the box and draws one again, repeating it five times.  a)... more
Probability Stats

08/10/15

How many possible combinations of six numbers could you chose?

If you are playing a lottery that requires you to select six numbers out of a possible 40, and the order of the six numbers does not matter, how many possible combinations of six numbers could you... more
Probability Stats

07/22/15

Using a Poisson Distribution, find P(3) if µ = 2. Round to 3 decimal places if necessary.

1.804 0.008 0.180 18.045 none of the above.
Probability Stats

06/23/15

Suppose I pick a jelly bean at random from a box containing five red and seven blue ones. I record the color and put the jelly bean back in the box.

What is the probability of getting a red jelly bean both times if I do this twice?  Give the probability as a decimal.
Probability Stats Math Statistics Probability

06/20/15

Probability Help!

1. Use the frequency distribution to find the expected value (mean), variance, and the standard deviation. Number of downloads (X) 27 28 30 31 32 Probability (P(X)) 0.15 0.2 0.3 0.25 0.1   2. You... more
Probability Stats Math Probability Math Help

06/15/15

probability, binomial experiment

According to a report of the Nielsen company 65% of internet searches in may 2010 used the google search engine. assume that a sample of 20 searches is studied.    a) what is the probability that... more

binomial experiment, probability

according to a report of the Nielsen company 65% of internet searches in may 2010 used the google search engine. Assume that sample of 20 searches is studied.   a) What is the probability that... more

what proportion of a normal distribution is within one standard deviation of the mean

how do i figure out what proportion of a normal distribution is within one standard deviation of the mean
Probability Stats

04/26/15

Statistics - Need some assistance with probability

On a scale of 0 to 100 the average score for consumers (in a grocery store) with a child on their arms to buy candy is    59. Assume that the standard deviation of the average score is 5. Also... more
Probability Stats

04/17/15

Statistics question: What is the approximate probability that more than 4% of the guests are pescatarian and that he will not have enough pescatarian meals?

An event planner does research and finds that approximately 2.75% of the people in the area where a large event is being held are pescatarian. Treat the 250 guests expected at the event as a simple... more

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