Probability Concepts and Calculations

Julia explains how to find probability using words and fractions. She introduces the concept of probability as the likelihood of an event occurring, typically expressed as a fraction. The numerator represents the desired outcomes, while the denominator represents all possible outcomes. Julia provides examples, such as flipping a coin and drawing beads from a bag, to illustrate how to calculate probability. She concludes by summarizing the process of finding probability using words and fractions.

What does probability measure?

• The number of possible outcomes

• The certainty of an event

• The number of desired outcomes

• The likelihood of an event occurring

How is probability usually expressed?

• As a decimal

• As a percentage

• As a fraction

• As a whole number

In a probability fraction, what does the numerator represent?

• Total number of outcomes

• Number of desired outcomes

• Probability of failure

• Probability of success

What does the denominator in a probability fraction indicate?

• Probability of success

• Number of all possible outcomes

• Probability of failure

• Number of desired outcomes

If you flip a coin, what is the probability of getting heads?

• 1/4

• 1/2

• 1/5

• 1/3

How many possible outcomes are there when flipping a coin?

• Three

• Two

• Four

• One

In a bag with 20 beads, 2 of which are red, what is the probability of drawing a red bead?

• 1/2

• 1/5

• 1/20

• 1/10

What is the simplified probability of drawing a red bead from a bag of 20 beads, 2 of which are red?

• 1/20

• 1/10

• 1/2

• 1/5

If a bag contains 4 white beads out of 20, what is the probability of drawing a white bead?

• 1/7

• 1/5

• 1/4

• 1/6

What is the probability of drawing a white bead from a bag with 4 white beads out of 20?

• 1/6

• 1/5

• 1/4

• 1/7