Stats Help for College-level Students

Intro to Statistics Question

A bowl contains 6 red, 4 black, and 3 yellow marbles. How many ways can 2 red, 2 black, and 1 yellow marble be drawn. a. 270 b. 540 c. 625 d. 100

Intro to Statistics Question

A shipment of 50 VCRs had 6 defectives. If a person bought two cameras, find the probability of getting 2 defectives. a. .50 b. .10 c. .0122 d. .05

Intro to Statistics Question

A retail sales worker finds that the probability of making a sale is .23. If she talks to four customer today, what is the probablility of her making four sales? a. 0.003 b. 0.03 c. 0.30 d. 0.001

At a school, the children miss school 17% of the days.

At a school, the children miss school 17% of the days. If one classroom has 12 children, what is the probability that no children will be absent on a given day. a. .107 b. .17 c. .201 d. .001

Intro to Statistics Question

A computer program has a probability of .2% for failing. If the program is run 500 times, what is the probability that it will not fail at all. a. .01 b. .03679 c. .3679 d. .5672

Intro to Statistics Question

If there are repeated independent trials and there are only two outcomes, what distribution should be used? a. binomial distribution b. multinomial distribution c. Poisson distribution d. hypergeometric distribution

Intro to Statistics Question

If there are repeated dependent trial, what distribution should be used? a. binomial b. multinomial c. Poisson d. hypergeometric

What is the distribution called when the majority of data values fall to the right of the mean?

What is the distribution called when the majority of data values fall to the right of the mean? a. positively skewed b. negatively skewed c. centrally skewed d. symmetrical

Random Variables -expected values problem

Regulators have found that 23 of the 68 investment companies that filed for bankruptcy in the past five years failed because of fraud, not for reasons related to the economy. Suppose that nine additional firms will be added to the bankruptcy rolls during the next quarter. How many of those failures are likely to be attribute to ...continues

Random Variables - Joint density

Let X and Y have the joint pdf f x,y(X,Y) = 2e^(-(x+y)) , 0