Grade 7 statistics and probability review quiz

📚 Quick Study Guide

• 🔢 Mean: The average of a set of numbers. Add all the numbers and divide by the total number of values. Formula: $\text{Mean} = \frac{\text{Sum of values}}{\text{Number of values}}$
• 📊 Median: The middle value in a sorted list of numbers. If there are two middle numbers, take their average.
• 🎯 Mode: The value that appears most frequently in a data set. A data set can have one mode, more than one mode, or no mode.
• 🎲 Probability: The likelihood of an event occurring. Calculated as: $\text{Probability} = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}}$
• 📈 Range: The difference between the largest and smallest values in a data set. $\text{Range} = \text{Largest Value} - \text{Smallest Value}$
• 📜 Sample Space: The set of all possible outcomes of an experiment.
• 🍀 Independent Events: Events where the outcome of one does not affect the outcome of the other.

📝 Practice Quiz

1. What is the mean of the following data set: 5, 10, 15, 20, 25?
   1. 12
   2. 15
   3. 18
   4. 20
2. What is the median of the following data set: 3, 7, 2, 9, 5?
   1. 2
   2. 3
   3. 5
   4. 7
3. What is the mode of the following data set: 1, 2, 2, 3, 4, 4, 4, 5?
   1. 2
   2. 3
   3. 4
   4. 5
4. A bag contains 3 red marbles, 2 blue marbles, and 5 green marbles. What is the probability of selecting a red marble?
   1. 1/2
   2. 1/3
   3. 1/5
   4. 3/10
5. What is the range of the following data set: 12, 5, 18, 2, 21?
   1. 16
   2. 17
   3. 19
   4. 23
6. A coin is flipped twice. What is the sample space?
   1. {H, T}
   2. {HH, TT}
   3. {HT, TH}
   4. {HH, HT, TH, TT}
7. You roll a die and flip a coin. What is the probability of rolling a 4 and getting heads?
   1. 1/2
   2. 1/4
   3. 1/6
   4. 1/12