IGCSE Data and probability revision

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

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

Back

P(E) = Number of favorable outcomes / Total number of outcomes.

Front

What does it mean to draw without replacement in probability?

Back

Drawing without replacement means that once an item is drawn from a set, it is not returned to the set before the next draw.

Front

What is a quartile in statistics?

Back

A quartile is a type of quantile that divides a ranked dataset into four equal parts.

Front

How do you find the lower quartile (Q1)?

Back

The lower quartile (Q1) is the median of the lower half of a dataset.

Front

What is the modal class in a frequency distribution?

Back

The modal class is the class interval that has the highest frequency.

Front

How do you calculate the percentage of a subset in a total?

Back

Percentage = (Number of subset / Total number) x 100.

Front

What is the difference between a sample and a population?

Back

A sample is a subset of a population, which is the entire group being studied.

Front

What is a box plot?

Back

A box plot is a graphical representation of a dataset that shows its minimum, first quartile, median, third quartile, and maximum.

Front

What does 'mutually exclusive events' mean?

Back

Mutually exclusive events are events that cannot occur at the same time.