Stats Help for College-level Students

Determining probability distribution with random variables, mean and standard deviation. Attachments in MS Word.

A wildlife biologist captures geese and weighs them. He determines that the weights are normally distributed with a mean of nine pounds and a standard deviation of 1.3 pounds. What is the probability that a goose captured at random will weigh between 8 pounds and 11 pounds?

Determining standard deviation using probability. Attachment in Word.

Imagine tossing a balanced coin eight times. Let X = the number of heads obtained in eight tosses. What is the standard deviation of X?

Determining the probability using mean and standard deviation. Attachments in Word.

A wildlife biologist captures geese and weighs them. He determines that the weights are normally distributed with a mean of 9 pounds and a standard deviation of 1.3 pounds. What is the probability that a goose captured at random will weigh more than 11 pounds?

Working with probability and standard deviation to determine a mean. Attachment in Word.

A sample of 16 is taken from a population which has a normal distribution with a mean of 10 and a standard deviation of 3. What is the probability that the sample mean is less than 11? Put your answer in decimal answer form.

Working with probability and standard deviation to determine the mean. Attachment in Word.

A sample of 25 is taken from a population which has a normal distribution with a mean of 10 and a standard deviation of 3. What is the probability that the sample mean is between 9.4 and 10.6? Place your answer in decimal form.

Determining the z-score using the mean and standard deviation.

A wildlife biologist captures geese and weighs them. He determines that the weights are normally distributed with a mean of 9 pounds and a standard deviation of 1.3 pounds. What is the z-score of a goose which weighs 7 pounds? Round the answer to 2 decimal places using the standard normal table.

Using a probability distribution table to determine the standard deviation. Attachment in Word.

Consider the following distribution: x P(=x) 40 .15 50 .30 70 .40 80 .15 What is the standard deviation of X? a) 7.81 b) 13.08 c) 13.75 d) 61 e) 171 f) 189

Determining the probability using mean and standard deviation.

A wildlife biologist captures geese and weighs them. He determines that the weights of the geese are normally distributed with a mean of 9 pounds and a standard deviation of 1.3 pounds. What is the probability that a goose captured at random will weigh less than 10.5 pounds?

Understanding the binomial probability coefficient and factorial notation.

What is a binomial coefficient and factorial notation?

Working with linear transformations.

Raw scores on behavioral tests are often transformed for easier comparison. A test of reading ability has mean 75 and standard deviation 10 when given to third graders. Sixth graders have a mean score of 82 and a standard deviation of 11 on the same test. To provide separate norms for each grade, we want scores in each grade ...continues