Name: ___________________

Date:___________________

kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Grade 4 - Mathematics
10.1 Probability

Probability
  • Is the chance of an event happening.
  • If a particular outcome can never occur, its probability is 0.
  • If an outcome is certain to occur, its probability is 1.
  • In general, if p is the probability that a specific outcome will occur, values of p fall in the range 0 <= p <= 1.
  • Probability may be expressed as either a decimal, a fraction, or a ratio.
  • Probability examples in everyday life include physical sciences, commerce, weather forecasting, board games, sports statistics, etc.

Examples:
What are the chances that the sun will shine this month? (likely)
What are the chances that you, a 11 year old boy, will be driving a car today? (unlikely)
What are the chances of tossing heads or tails on a coin? (equally likely)

Coin: 2 sides
The probability of rolling heads is 1/2
The probability of rolling tails is 1/2

Cube: 6 sides
Take a number cube and label the sides 1 - 6.
The probability of rolling a 3 is one outcome out of a total of six possible outcomes, that is 1/6.
Similarly, the probability of rolling a 5 is also 1/6.
The probability of rolling an odd number (1, 3, 5) = three outcomes out of a total of six possible outcomes = 3/6 = 1/2
Probability of rolling an even number is also same as rolling an odd numbers (3/6 or 1/2).

Example: A bag contains 4 red balls and 3 green balls. What is the probability of picking a green ball?
Since there are three green and 1 is picked out at a time, the probability is 3/7.
Answer: 3/7


Directions: Solve the following questions. Also write at least 10 examples of your own.
Q 1: The probability of an event is
term that is used in math
the chance that it will happen

Q 2: There are 4 balls of the same size in a container. 2 are red, 1 is green and 1 is blue. Dan reaches in and draws out 1 ball. What is the probability that it is green?
1 out of 4
1 out of 2
1 out of 3

Q 3: There are 4 balls of the same size in a container. 2 are red, 1 is green and 1 is blue. Dan reaches in and draws out 1 ball. What is the probability that it is red ball?
1 out of 4
1 out of 3
2 out of 4

Q 4: There are 4 balls of the same size in a container. 2 are red, 1 is green and 1 is blue. Dan reaches in and draws out 1 ball. What is the probability that it is blue ball?
1 out of 4
2 out of 4
1 out of 3

Question 5: This question is available to subscribers only!

Question 6: 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 http://www.kwizNET.com.