How do you know that a word problem involves normal distribution? Look for the key phrase “ assume the variable is normally distributed ” or “ assume the variable is approximately normal.”

Normal probability practice problems and answers. How to find a z score and look it up in the z table. Easy guide to solving normal probability problems.

Dozens of step by step articles on how to use the TI 83 for statistics. Includes short videos with solutions to many common problems.

A z-score tells you where the score lies on a normal distribution curve. A score of zero tells you the values is exactly average while a score of +3 tells you that the value is much higher than …

When it comes to finding appropriate sample sizes, limiting probability distributions are important: the process in basic statistics involves taking a random sample of observations and fitting that …

Variance and Standard Deviation problems are perhaps the most basic problems elementary statistics students are taught. They are taught in the first couple days of any statistics course. …

If you are looking for other variations of word problems like this (for example, finding the area for a value between 0 and any z-score, or between two z-scores, see the normal distribution curve …

Two distributions that commonly represent the spread of test scores are the normal distribution and bimodal distribution. The random variable “test score” might have a .7 probability of …

A unimodal distribution is any distribution with a single peak, cluster, or high point. It comes from the Latin word uni- (“one”) and Middle French modal (“measure”).

Although it’s more common to refer to the tails as being on the “left” or “right”, this can pose problems if you aren’t looking at a graph. In other words, if you’re dealing with a set of data, it …