HPC - ACT Math Practice - (Pre-Algebra)

Front

What is the definition of probability?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 and 1.

Front

How do you calculate the probability of an event?

Back

Probability = (Number of favorable outcomes) / (Total number of possible outcomes).

Front

What is a congruent section in a spinner?

Back

Congruent sections are parts of a spinner that are equal in size and shape, allowing for equal chances of landing on any section.

Front

What does it mean for a number to be divisible by 3?

Back

A number is divisible by 3 if, when divided by 3, it results in a whole number with no remainder.

Front

What is the total number of sections in the spinner described?

Back

The spinner has 25 congruent sections.

Front

If a spinner has 25 sections, how many sections are divisible by 3?

Back

There are 8 sections (3, 6, 9, 12, 15, 18, 21, 24) that are divisible by 3.

Front

What is the formula for calculating the mean (average) of a set of numbers?

Back

Mean = (Sum of all values) / (Number of values).

Front

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

Back

To find the median, arrange the numbers in order and identify the middle number. If there are two middle numbers, average them.

Front

What is the definition of a variable in mathematics?

Back

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

Front

What is the difference between a rational and an irrational number?

Back

Rational numbers can be expressed as a fraction of two integers, while irrational numbers cannot be expressed as a simple fraction.