Stats Help for College-level Students

Probability Problem

A company finds that on average 20% of all new employees resign during their first year of employment. Find the probability that, among the next 30 employees hired, exactly five will resign during their first year of employment.

Mean and Standard Deviation

X ~ B (1603, 0.57). Find the mean and the standard deviation of X.

Find the mean and standard deviation of X:

The random variable X is the number of houses per month sold by a realtor. The probability distribution is given below. Find the mean and standard deviation of X: X (houses sold) / f(x) ____________________________________________ (0 , 0.24) (1 , 0.01) (2 , 0.12) (3 ...continues

Unusual Result

A candy company claims that 92% of consumers like their candies. To test this claim, 9571 people are selected at random from those who have eaten the company's candies. 791 rate the candies as unsatisfactory. Is this an unusual result (show criterion for determining the answer to this question)? Also, how do you interpret your s ...continues

Poisson Distribution

The number of calls to a taxi service averages 14.4 per 24-hour day. Using the poisson distribution, find the probability that, in a randomly selected hour, no calls will be received.

Random Guessing Probability

A person makes random guesses for 10 true-false questions on a test. Find the probability that the student answers at least one question correctly.

Simple Statistics Problem

16 wrestlers compete in a competition. If each wrestler has one match with each of the other 15 wrestlers, what is the total number of matches.

Different Combinations

There are 8 members on the board of directors. If the board must form a committee of 6 members, how many different ways may the committee be selected from among the 8 board members?

binomial probability density function

Identify each variable in the formula for the binomial probability density function. Also, explain what the fraction: n! / (n-x)!x! calculates.

Unusual Results - Interpreting Statistical Result

A candy company claims that 92% of consumers like their candies. To test this claim, 9571 people are selected at random from those who have eaten the company's candies. 791 rate the candies as unsatisfactory. Is this an unusual result (show criterion for determining the answer to this question)? Also, how do you interpret your s ...continues