kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant
on highly effective K-12 Math & English
Online Quiz (
Questions Per Quiz =
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.
: Determine whether the data 14, 15, 11, 13, 13, 14, 15, 14, 12, 13, 14, 15 appear to be positively skewed, negatively skewed, or normal distributed.
: Continuous probability distributions are represented by _______.
Question 3: This question is available to subscribers only!
Question 4: This question is available to subscribers only!
Subscription to kwizNET Learning System
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
Choice of Math, English, Science, & Social Studies Curriculums
Excellent value for K-12 and ACT, SAT, & TOEFL Test Preparation
Get discount offers by sending an email to
Terms of Service