kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant
on highly effective K-12 Math & English
High School Mathematics - 2
11.9 Normal and Skewed Distributions
Normal and skewed distributions:
The probability distributions we studied so far are
discrete probability distributions
because they have only a finite number of possible values.
A discrete probability distribution can be represented by a histogram.
continuous probability distribution
, the outcome can be any value in an interval of real numbers.
Continuous probability distributions are represented by curves instead of histograms.
Such curves are often called a
Many distributions with symmetric curves or histograms are
In normal distributions scores are more concentrated in the middle than in the tails.
A curve or histogram that is not symmetric represents a
Positive skew: The right tail is longer and the mass of the distribution is concentrated on the left of the figure. The distribution is said to be right-skewed.
Negative skew: The left tail is longer and the mass of the distribution is concentrated on the right of the figure. The distribution is said to be left-skewed.
: A curve that is not symmetric represents a ______ distribution.
Question 2: This question is available to subscribers only!
Subscription to kwizNET Learning System
costs less than $1 per month & offers the following benefits:
Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
Instant scoring of online quizzes
Progress tracking and award certificates to keep your student motivated
Unlimited practice with auto-generated 'WIZ MATH' quizzes
Child-friendly website with no advertisements
© 2003-2007 kwizNET Learning System LLC. All rights reserved. This material may not be reproduced, displayed, modified or distributed without the express prior written permission of the copyright holder. For permission, contact info@kwizNET.com
For unlimited printable worksheets & more, go to