Understanding Probability Events: Definition and Examples for Grade 7

📚 Understanding Probability Events: A Quick Study Guide

🔍 Probability: Probability is a measure of how likely an event is to occur. It is expressed as a number between 0 and 1. 💡 Event: An event is a specific outcome or a set of outcomes of a random experiment. 📝 Simple Event: A simple event is an event that has only one outcome. Example: Flipping a coin and getting heads. 📊 Formula: The probability of an event (P(event)) is calculated as: $P(event) = \frac{Number\ of\ favorable\ outcomes}{Total\ number\ of\ possible\ outcomes}$ 🎲 Example 1: Rolling a fair six-sided die. The probability of rolling a 4 is $\frac{1}{6}$ because there is only one '4' and six total sides. ⚽ Example 2: Drawing a marble from a bag containing 3 red marbles and 5 blue marbles. The probability of drawing a red marble is $\frac{3}{8}$. 🧮 Key Concepts:
📌 Certain Event: An event that will definitely occur (probability = 1). 📍 Impossible Event: An event that cannot occur (probability = 0).

🧪 Practice Quiz

1. What is the probability of flipping a fair coin and getting tails?
   1. $\frac{1}{4}$
   2. $\frac{1}{3}$
   3. $\frac{1}{2}$
   4. 1
2. A bag contains 2 green balls and 8 yellow balls. What is the probability of picking a green ball?
   1. $\frac{1}{10}$
   2. $\frac{1}{5}$
   3. $\frac{2}{5}$
   4. $\frac{4}{5}$
3. What is the probability of rolling a 7 on a standard six-sided die?
   1. $\frac{1}{6}$
   2. 1
   3. $\frac{1}{2}$
   4. 0
4. A spinner has 4 equal sections colored red, blue, green, and yellow. What is the probability of landing on blue?
   1. $\frac{1}{2}$
   2. $\frac{1}{3}$
   3. $\frac{1}{4}$
   4. 1
5. If you have a deck of 52 cards, what is the probability of drawing a heart?
   1. $\frac{1}{2}$
   2. $\frac{1}{4}$
   3. $\frac{1}{13}$
   4. $\frac{4}{13}$
6. A jar contains 5 candies: 1 grape, 2 strawberry, and 2 cherry. What is the probability of picking a strawberry candy?
   1. $\frac{1}{5}$
   2. $\frac{2}{5}$
   3. $\frac{3}{5}$
   4. $\frac{4}{5}$
7. What is the probability that the sun will rise tomorrow?
   1. 0
   2. $\frac{1}{2}$
   3. $\frac{1}{4}$
   4. 1