Page 63 - SPARK OF MATH book 6

Working out the probability of rolling a dice.

1
Example 1 :
Example:

What is the probability of getting a 3 when you roll a dice?

There are six possible outcomes:

Only one outcome is successful, the 3. We make a fraction to
work it out:

Probability of number of successful outcomes
getting a 3 number of sample space

1
6

1
The probability of getting a 3 is .
6
1
The probability of getting any of the numbers on a dice is .
6
They are all equally likely.

Example: 2

What is the probability of getting an even number when you roll a

dice? there are 6 numbers on a dice. There are 3 even numbers
(2, 4 and 6).

Number of successful outcomes

number of sample space

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