REVIEW STATISTICS SEMESTER EXAM

Front

What is the median of a set of numbers?

Back

The median is the middle value in a list of numbers sorted in ascending order. If there is an even number of observations, the median is the average of the two middle numbers.

Front

How do you find the median of Roger's bowling scores: 155, 165, 138, 172, 127, 193, 142?

Back

First, sort the scores: 127, 138, 142, 155, 165, 172, 193. The median is the middle score, which is 155.

Front

What is an inequality?

Back

An inequality is a mathematical statement that compares two expressions, showing that one is greater than, less than, or not equal to the other.

Front

How do you write an inequality for a graph?

Back

To write an inequality for a graph, identify the regions represented by the shaded area and the boundary line, then express the relationship using inequality symbols.

Front

What does 'x ≤ -2 OR x > 5' represent graphically?

Back

This inequality represents two regions on a number line: all values less than or equal to -2 and all values greater than 5.

Front

What is the solution to the equation 12 + 5w - 4w = 15?

Back

Combine like terms to get 12 + w = 15. Subtract 12 from both sides to find w = 3.

Front

What is a variable in mathematics?

Back

A variable is a symbol used to represent an unknown value in mathematical expressions or equations.

Front

In the equation 5x - 4y = 11 and 5x + 4y = -14, which variable is eliminated when adding the equations?

Back

The y variable is eliminated when the two equations are added together.

Front

What is the purpose of solving inequalities?

Back

Solving inequalities helps to find the range of values that satisfy a given condition, often represented graphically.

Front

How do you determine the number of athletes from a specific country in a dataset?

Back

Count the occurrences of the specific number of athletes for each country in the dataset.