Pre-Algebra 8 Final Exam Interactive Review

Front

What is the perimeter of a rectangle with length 15 feet and width 21 feet?

Back

The perimeter is 72 feet, calculated as P = 2(length + width) = 2(15 + 21) = 72.

Front

How do you calculate the mean of a set of numbers?

Back

To calculate the mean, add all the numbers together and divide by the total count of numbers. For example, for the set 12, 14, 11, 12, 18, 15, 9, 32 (excluding the outlier 32), the mean is 13.

Front

What is the result of 5 + (-2)?

Back

The result is 3.

Front

What does 'undefined' mean in mathematics?

Back

Undefined is to be thought of as the opposite of the opposite or the original thing itself.

Front

If a shirt is bought for 35% off the original price of $45, what expression represents the price of the shirt?

Back

The expression is 0.65(s), where s is the original price.

Front

What is the formula for the area of a rectangle?

Back

The area of a rectangle is calculated as A = length × width.

Front

What is an outlier in a data set?

Back

An outlier is a value that is significantly higher or lower than the other values in a data set.

Front

How do you find the median of a set of numbers?

Back

To find the median, arrange the numbers in order and select the middle number. If there is an even number of values, average the two middle numbers.

Front

What is the difference between mean and median?

Back

Mean is the average of a set of numbers, while median is the middle value when the numbers are arranged in order.

Front

What is the absolute value of a number?

Back

The absolute value of a number is its distance from zero on the number line, regardless of direction.