Data Analysis PSAT practice

Front

What is the definition of percentage?

Back

A percentage is a fraction expressed as a part of 100. It represents how much of a whole is being considered.

Front

How do you calculate the percentage of data within a range?

Back

To calculate the percentage of data within a range, divide the number of data points in that range by the total number of data points, then multiply by 100.

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

Front

What does P(not D) represent in probability?

Back

P(not D) represents the probability that event D does not occur.

Front

How do you find the probability of multiple events occurring?

Back

For independent events, multiply the probabilities of each event. For mutually exclusive events, add the probabilities.

Front

What is the definition of a sample space in probability?

Back

A sample space is the set of all possible outcomes of a probability experiment.

Front

What is the formula for finding the probability of an event A or event B occurring?

Back

P(A or B) = P(A) + P(B) - P(A and B).

Front

How do you interpret a probability of 1/2?

Back

A probability of 1/2 means there is an equal chance of the event occurring or not occurring.

Front

What is the definition of a random variable?

Back

A random variable is a variable whose possible values are numerical outcomes of a random phenomenon.