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Introduction to Probability

Module by: Kenny M. Felder. E-mail the author

Summary: This module provides an introduction which develops concepts related probability.

Exercise 1

Suppose you roll a 4-sided die, which gives equal probabilities of rolling 1, 2, 3, or 4. (*Yes, these really do exist.)

  • a. What is the probability that you will roll a 3?
  • b. Explain, in your own words, what your answer to part (a) means. Do not use the words “probability” or “chance.” A typical 9-year-old should be able to understand your explanation.
  • c. What is the probability that you will roll an even number?
  • d. What is the probability that you will roll a number less than 3?
  • e. What is the probability that you will roll a number less than 4?
  • f. What is the probability that you will roll a number less than 7?

Exercise 2

Suppose you roll two 4-sided dice.

  • a. Draw a tree diagram showing all the possible outcomes for both rolls.
  • b. What is the probability that you will roll “3 on the first die, 2 on the second?”
  • c. What is the probability that you will roll “3 on one die, 2 on the other?”
  • d. What is the probability that the sum of both dice will be a 5?

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

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Any individual member, a community, or a respected organization.

What are tags? tag icon

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