Easy GRE Data Analysis Set 2 Practice Questions

Quantitative reasoning on the GRE often involves interpreting visual information through charts, tables, and graphs to solve real-world problems. By focusing on Easy GRE Data Analysis Set 2 Practice Questions, you can build a solid foundation in basic statistical concepts like mean, median, and percent change. These skills are essential for the GRE Prep journey, as they appear in nearly every section of the quantitative exam. Proficiency in data analysis requires more than just calculation; it demands the ability to quickly scan a data set for relevant information while ignoring distractors.

Concept Explanation

Data analysis on the GRE refers to the collection of skills used to interpret, analyze, and manipulate data presented in various formats such as bar graphs, line graphs, and frequency distributions. At this level, the focus is on understanding the relationship between variables and performing basic arithmetic operations on data sets. Key concepts include identifying trends over time, calculating the arithmetic mean, and determining the probability of a single event. Many students find it helpful to use an AI Question Generator to practice these foundational skills repeatedly until they become second nature.

To excel in this section, you must be comfortable with the following:

• Data Interpretation: Reading values directly from a chart or table accurately.
• Descriptive Statistics: Calculating the mean (average), median (middle value), and range (difference between max and min).
• Percent Change: Using the formula $\ \text{Percent Change} = \ \frac{\ \text{New} - \ \text{Old}}{\ \text{Old}} \ \times 100$.
• Probability: Calculating the likelihood of an event as $\ \frac{\ \text{Number of Favorable Outcomes}}{\ \text{Total Number of Outcomes}}$.

For more comprehensive practice, you may want to review Free GRE Practice Questions to see how these concepts are integrated into the broader exam structure.

Solved Examples

Review these worked examples to understand the step-by-step logic required for easy-level data analysis questions.

Example 1: Mean Calculation
A small business recorded daily sales for five days: $120, $150, $130, $190, and $160. What is the average daily sale for this period?

1. Identify the values: 120, 150, 130, 190, 160.
2. Sum the values: $120 + 150 + 130 + 190 + 160 = 750$.
3. Divide by the number of days (5): $\ \frac{750}{5} = 150$.
4. The average daily sale is $150.

Example 2: Percent Increase
In 2020, a library had 4,000 books. In 2021, the number of books increased to 5,000. What was the percent increase in the number of books?

1. Identify the old value (4,000) and the new value (5,000).
2. Find the difference: $5,000 - 4,000 = 1,000$.
3. Divide the difference by the old value: $\ \frac{1,000}{4,000} = 0.25$.
4. Convert to a percentage: $0.25 \ \times 100 = 25\%$.

Example 3: Reading a Table
Consider a table showing the number of students in three classes: Class A (25), Class B (30), and Class C (20). If 20% of the students in Class B are absent, how many students are present in Class B?

1. Locate Class B data: 30 students.
2. Calculate the number of absent students: $30 \ \times 0.20 = 6$.
3. Subtract the absent students from the total: $30 - 6 = 24$.
4. There are 24 students present.

Practice Questions

Test your skills with these Easy GRE Data Analysis Set 2 Practice Questions. These are designed to mirror the difficulty of the initial quantitative sections.

1. A set of numbers consists of {4, 8, 12, 16, 20}. What is the median of this set?

2. A pie chart shows that 40% of a company’s budget is spent on salaries. If the total budget is $500,000, how much is spent on items other than salaries?

3. In a group of 50 people, 15 prefer tea, 25 prefer coffee, and 10 prefer water. What is the probability that a person chosen at random prefers coffee?

4. The price of a stock dropped from $80 to $60. What was the percent decrease in the stock price?

5. If the mean of four numbers is 10, and three of the numbers are 8, 12, and 7, what is the fourth number?

6. A bar graph indicates that a store sold 50 units in January, 70 units in February, and 60 units in March. What is the total number of units sold over the three months?

7. In a list of integers {2, 5, 2, 8, 10, 2, 7}, what is the mode?

8. A data set has a range of 15. If the smallest number in the set is 4, what is the largest number?

Answers & Explanations

1. Answer: 12. The median is the middle value of a sorted list. In the set {4, 8, 12, 16, 20}, the middle value is 12.

2. Answer: $300,000. If 40% is spent on salaries, then 60% is spent on other items. $0.60 \ \times 500,000 = 300,000$. Alternatively, calculate salaries ($0.40 \ \times 500,000 = 200,000$) and subtract from the total: $500,000 - 200,000 = 300,000$.

3. Answer: 1/2 or 0.5. Probability is favorable outcomes divided by total outcomes. There are 25 coffee drinkers out of 50 people. $\ \frac{25}{50} = \ \frac{1}{2}$.

4. Answer: 25%. Use the percent change formula: $\ \frac{80 - 60}{80} = \ \frac{20}{80} = 0.25$. Multiply by 100 to get 25%.

5. Answer: 13. If the mean of 4 numbers is 10, the sum must be $4 \ \times 10 = 40$. The sum of the known numbers is $8 + 12 + 7 = 27$. The fourth number is $40 - 27 = 13$.

6. Answer: 180. Simply sum the values provided: $50 + 70 + 60 = 180$ units.

7. Answer: 2. The mode is the number that appears most frequently. In the set {2, 5, 2, 8, 10, 2, 7}, the number 2 appears three times, more than any other number.

8. Answer: 19. Range is defined as the difference between the maximum and minimum values. $\ \text{Max} - 4 = 15$, so $\ \text{Max} = 19$.

If you need to check your progress against more varied question types, explore our GRE Practice Questions with Explanations for deeper insights.

1. Which statistical measure represents the most frequent value in a data set?

• AMean
• BMedian
• CRange
• DMode

Frequently Asked Questions

What is the difference between mean and median on the GRE?

The mean is the arithmetic average calculated by summing all values and dividing by the count, while the median is the middle value when the data is ordered. The GRE often tests both to see if you can distinguish between a value affected by outliers (mean) and one that is not (median).

How do I calculate percent change for data analysis?

Subtract the original value from the new value, divide that difference by the original value, and multiply by 100. This formula is vital for interpreting growth or decline in charts and tables found in GRE Practice Questions with Answers.

What does a "range" tell me about a data set?

The range indicates the spread of the data by showing the distance between the smallest and largest values. It is a simple measure of dispersion that helps identify how much the data varies from one extreme to the other.

Are calculators allowed for GRE Data Analysis questions?

Yes, an on-screen calculator is provided during the GRE Quantitative Reasoning sections. However, for easy-level questions, it is often faster to perform mental math or simple scratchpad calculations to save time.

How frequently does probability appear in the data analysis section?

Basic probability typically accounts for a few questions per section, often involving simple ratios or independent events. Understanding the fundamental rule of "favorable over total" is usually sufficient for easy-level questions.