Grade 7 Statistics and Probability test pdf

📚 Quick Study Guide

🔍 Statistics: The science of collecting, organizing, analyzing, and interpreting data. 📊 Data Collection: Methods like surveys, experiments, and observations used to gather information. ➕ Measures of Central Tendency: Values that describe the center of a data set:
• Mean: The average of a set of numbers. Calculated as: $Mean = \frac{Sum \, of \, values}{Number \, of \, values}$
• Median: The middle value when the data is arranged in order.
• Mode: The value that appears most frequently.
📈 Range: The difference between the highest and lowest values in a data set. 🎲 Probability: The likelihood of an event occurring. Calculated as: $Probability = \frac{Number \, of \, favorable \, outcomes}{Total \, number \, of \, possible \, outcomes}$ 🎯 Sample Space: The set of all possible outcomes of an experiment. 🧩 Events: Specific outcomes or sets of outcomes. 💯 Probability Scale: Ranges from 0 (impossible) to 1 (certain).

🧪 Practice Quiz

1. What is the median of the following data set: 2, 5, 8, 11, 15?
• A) 5
• B) 8
• C) 11
• D) 15


2. A bag contains 3 red marbles, 2 blue marbles, and 5 green marbles. What is the probability of picking a blue marble?
• A) 2/10
• B) 3/10
• C) 5/10
• D) 1/2


3. What measure of central tendency is most affected by outliers?
• A) Mean
• B) Median
• C) Mode
• D) Range


4. What is the range of the following data set: 10, 15, 20, 25, 30?
• A) 5
• B) 10
• C) 15
• D) 20


5. A spinner has 4 equal sections labeled 1, 2, 3, and 4. What is the probability of spinning a 2?
• A) 1/2
• B) 1/3
• C) 1/4
• D) 3/4


6. Which of the following is NOT a method of data collection?
• A) Survey
• B) Experiment
• C) Observation
• D) Assumption


7. What is the mode of the following data set: 3, 3, 5, 6, 6, 6, 8?
• A) 3
• B) 5
• C) 6
• D) 8