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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

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: A spinner with 8 sections of equal size with 1 through 8 numbers on them. What is the probability of Melissa getting a 3 or a 5?
1/8
3/8
2/8

Q 2: The probability of an event is
the chance that it will happen
term that is used in math

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?
2 out of 4
1 out of 3
1 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 green?
1 out of 3
1 out of 2
1 out of 4

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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