Probability Diagrams & Multiple Events (Cambridge (CIE) IGCSE International Maths: Core): Flashcards

True.

A two-way table is used to compare two types of characteristics.

E.g. school year group and favourite genre of movie.

1. Identify the two characteristics, e.g. favourite colours, gender

2. Use rows for one characteristic and columns for the other

3. Add an extra row and column for marginal totals

False.

When completing a two-way table, some values can be filled in directly from the question information, but some values will need to be worked out.

E.g. you may need to subtract other values in a row from the row total to find a missing value.

You can double-check your answers when completing a two-way table by making sure that all row and column totals add up correctly, and that they match the grand total.

The probability of a particular event occurring can be worked out by finding the number of successes by the total number.

E.g. the probability that a student's favourite subject is Physics is .

AND means multiply () and is used for independent events to find the probability of both events occurring.

E.g. the probability of events A and B occurring is .

OR means add (+) and is used for mutually exclusive events to find the probability of one event or the other event occurring.

E.g. the probability of either event A and/or event B occurring is .

True.

As long as the possibilities considered are all mutually exclusive (non-overlapping), then the sum of all probabilities is 1.

If and are independent events, then the probability of both events occurring is:

.

If and are mutually exclusive events, then the probability of one or the other of them occurring is:

.