Probability

Question 1

What do probabilities always add up to?

Answer 1

1

Question 2

How do you work out the probability for any event?

Answer 2

P(event happens) + P(event doesn’t happen)

Question 3

What are the rules for the event probability?

Answer 3

• All possible outcomes are included

- Only one outcome can happen at a time

Question 4

What is relative and expected frequency?

Answer 4

Calculated after a probability experiment

Question 5

What is the formula for relative frequency?

Answer 5

Frequency / Number of trials

Question 6

Example:

If a dice is rolled 150x and the results was a 4 in 25 of these rolls

Answer 6

25 / 150 = 1/6

Question 7

What is the formula for expected frequency?

Answer 7

Relative frequency x number of trials

Question 8

What is probability always between?

Answer 8

0 - 1

Question 9

What is the only time a probability isn’t between 0 - 1?

Answer 9

When its a percentage and it’s out of 100

Question 10

What is probability?

Answer 10

A measure of chance or likelihood of something happening

Question 11

What is the rule of OR?

Answer 11

To find the P (A) OR P (B)

P (A) + P (B)

Question 12

Example: ( The Rule Of OR )

Answer 12

P (A) = 12/40
P (B) = 15/ 40

12/40 + 15/40 = 27/40