McGraw-Hill Education GRE 2019

Solution: Look at the columns! Notice that 85 is the average of 80 and 90. If 80 and 90 appeared with equal frequency, then the ...

Why? Because there will be 25 data points below this value and 25 data points above this value. A certain test was administered ...

Exercise: Statistics Discrete Quantitative Questions Bob’s average for three tests was 83. If he scored 72 and 94 on the first ...

In 2012, a store’s average monthly revenue was $20,000. For the first 10 months of the year, the store’s average monthly revenu ...

If a is the standard deviation of b, c, and d, what is the standard deviation of b + 3, c + 3, and d + 3, in terms of a? A a B ...

Quantitative Comparison Questions Each of the following questions consists of two quantities, Quantity A and Quantity B. You are ...

QUANTITY A QUANTITY B A B C D b > a > 0 QUANTITY A QUANTITY B A B C D a, b, and c are positive integers QUANTITY A QUA ...

A Since the set has an even number of items, the median is the average of the two middle terms: 5 + 9 2 = 7. The average of the ...

value, the spread between the data points will not change. Thus the standard deviation will not change. Since the standard devia ...

The comparison is now: Quantity A Quantity B 2 a + 3 b 3 a + 2 5 b Cross-multiply: ↓ 5(2a + b) 3(3a + 2b) Distribute: ↓ 10 a + 5 ...

The primary difference in the two equations is the following: For distance questions, rate represents distance per unit of time ...

Step 2: Once you have done so, you can plug the values into the formula: rate (mi/hr) × time (hr) = distance (miles) ↓ ↓ ↓ 5 × 1 ...

Train A and train B start at the same point and travel in opposite directions. Train A travels at a constant rate of 80 miles pe ...

Don’t Average Rates! Look at the following question: Sarah goes on a 600-mile trip. She travels at a constant rate of 50 miles p ...

Work Problems: Rate × Time = Work The second type of rate problem involves work. In contrast to distance problems, work problems ...

Combining Rates In certain work questions, you will be given the individual rates of two or more elements and will be asked abou ...

Exercise: Rates Discrete Quantitative Questions For this question, write your answer in the box. Susan takes a 45-mile trip. Sh ...

Four machines, working independently at the same constant rate, can fill a production lot in 3 hours. How many of these machine ...

Working alone at a constant rate, Machine A can produce 15 widgets in 2 minutes. Working alone at a constant rate, Machine B ca ...

Quantitative Comparison Questions Each of the following questions consists of two quantities, Quantity A and Quantity B. You are ...