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One die is rolled. What is the probability of not getting a \(5 ?\)

Short Answer

Expert verified
The probability of not getting a 5 when a die is rolled is \(\frac{5}{6}\).

Step by step solution

01

Determine Total Outcomes

There are 6 possible outcomes when rolling a standard die, as it has 6 faces, each with a different number ranging from 1 to 6 inclusive.
02

Determine Favorable Outcomes

Since we're looking for the likelihood of not getting a 5, we're interested in any outcome that does not result in a 5. With this, there 5 favorable outcomes: rolling a 1, 2, 3, 4 or 6.
03

Calculate the Probability

In probability, we calculate the likelihood of an event happening by dividing the number of favorable outcomes by the total outcomes. Therefore, here the probability is \(\frac{5}{6}\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Total Outcomes
When you're rolling a die, understanding the concept of total outcomes is crucial. A standard six-sided die, which is commonly used in games and probability exercises, has 6 distinct faces. Each face represents a different number from 1 to 6. So, every time you roll the die, there are exactly 6 possible outcomes you could get.

These outcomes can be listed as follows:
  • Outcome 1: Rolled a 1
  • Outcome 2: Rolled a 2
  • Outcome 3: Rolled a 3
  • Outcome 4: Rolled a 4
  • Outcome 5: Rolled a 5
  • Outcome 6: Rolled a 6
Total outcomes refer to all the potential results from a single event.
By clearly understanding this, you can better assess which results are relevant to any given question about probability.
Favorable Outcomes
The idea of favorable outcomes focuses on the specific outcomes that meet the criteria of the event you're examining. In probability problems, it's common to focus on specific desired results.

For instance, when asked about the probability of NOT rolling a 5 on a single roll of a die, we consider which outcomes do not include the number 5. In this scenario, the favorable outcomes are:
  • Rolling a 1
  • Rolling a 2
  • Rolling a 3
  • Rolling a 4
  • Rolling a 6
There are 5 favorable outcomes because each one represents a roll that does not produce a 5.
The favorable outcomes determine which numbers will contribute to calculating the desired probability.
Rolling a Die
Rolling a die is a simple but important concept in probability. It serves as a classic exercise to explore probability fundamentals. Each roll of a die is an independent event, meaning previous rolls do not affect future rolls.

This randomness makes dice excellent tools for teaching how to calculate probabilities, as the outcomes are easy to predict and enumerated clearly. Understanding rolling a die involves knowing:
  • Each face has an equal chance of landing face up.
  • For a fair die, each face has a probability of 1 out of 6, or roughly 16.67%.
It's important to consider the role of randomness and equality when using a die in probability.
This planning helps introduce greater concepts in probability and paves the way for tackling more complex scenarios.

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