probability simple events

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, where 0 indicates impossibility and 1 indicates certainty.

Front

What is the formula for calculating the probability of a simple event?

Back

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

Front

What does it mean if an event is described as 'unlikely'?

Back

An event is described as 'unlikely' if its probability is less than 0.5.

Front

What is the probability of an event that is certain to happen?

Back

The probability of an event that is certain to happen is 1.

Front

What is the probability of an event that cannot happen?

Back

The probability of an event that cannot happen is 0.

Front

How do you express probability as a percentage?

Back

To express probability as a percentage, multiply the probability (a decimal) by 100.

Front

What is the probability of spinning an even number on a spinner with numbers 1 to 10?

Back

The probability of spinning an even number is 5/10 or 50%.

Front

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

Back

The probability of landing on yellow is 1/4 or 25%.

Front

How do you calculate the probability of selecting a boy from a group of 15 boys and 15 girls?

Back

The probability of selecting a boy is calculated as: P(boy) = Number of boys / Total number of students = 15 / (15 + 15) = 1/2.

Front

What is the probability of spinning red if the spinner has 5 sections: 1 red, 2 blue, and 2 yellow?

Back

The probability of spinning red is 1/5 or 20%.