Purchase Solution

Statistics: Normal Distribution and Standard Deviation

Not what you're looking for?

Ask Custom Question

Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6.

a. What is the probability that a randomly selected exam will have a score of at least 71?

b. What percentage of exams will have scores between 89 and 92?

Purchase this Solution

Solution Summary

This solution shows how to find the probability of an event, i.e. that an exam will have a certain score, and how to find the percentage of exams that have scores that fall within a specified range.

Solution Preview

Let X be the score on a recent national statistics exam.

a. What is the probability ...

Purchase this Solution


Free BrainMass Quizzes
Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.