Probability

Front

What is probability?

Back

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

Front

What is the formula for calculating the probability of an event?

Back

The probability of an event is calculated using the formula: P(E) = Number of favorable outcomes / Total number of outcomes.

Front

What does it mean to find the probability of 'OR' events?

Back

Finding the probability of 'OR' events means calculating the likelihood of either one event occurring or another. For mutually exclusive events, P(A OR B) = P(A) + P(B).

Front

How do you calculate the probability of 'NOT' an event?

Back

The probability of 'NOT' an event is calculated as: P(NOT A) = 1 - P(A).

Front

If a bag contains 36 skittles with 12 red and 5 orange, what is the probability of pulling out a red or orange skittle?

Back

P(Red OR Orange) = P(Red) + P(Orange) = \frac{12}{36} + \frac{5}{36} = \frac{17}{36}.

Front

What is a sample space in probability?

Back

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

Front

What is an event in probability?

Back

An event is a specific outcome or a set of outcomes from a probability experiment.

Front

What is the probability of pulling an orange marble from a bag with 6 marbles (1 orange, 5 others)?

Back

P(Orange) = \frac{1}{6}.

Front

If a spinner has 4 equal sections (1 blue, 1 red, 1 green, 1 yellow), what is the probability of landing on blue?

Back

P(Blue) = \frac{1}{4}.

Front

What is the expected value in probability?

Back

The expected value is the average outcome of a probability experiment, calculated as the sum of all possible values, each multiplied by its probability.