Probability basics
The probability of an impossible event
0
What is theoretical probability?
This type of probability is based on what should happen.
The probability of rolling an even number on a fair six-sided die.
3/6 or 1/2
This is the middle value when data is arranged in order.
median
This graph uses connected bars and is often used for continuous numerical data.
Histogram
This is the probability of a certain event.
1
What is experimental probability?
This type of probability is based on actual results from an experiment.
The probability of selecting a vowel from the word MATHS.
1/5
This is the value that appears most often in a data set.
mode
In a frequency table, this tells you how many times a value occurs.
frequency
Probability values must lie between these two numbers.
0 and 1
A coin is tossed 40 times and lands on heads 22 times. The experimental probability of heads is this.
22/40 or 11/20?
The probability of drawing a heart from a standard deck of cards.
13/52 or 1/4
Find the mean of 4, 6, 8, 10, 12.
8
The best average to use when there is an outlier is often this.
median
A bag has 5 red balls and 3 blue balls. The probability of picking a blue ball is this fraction.
3/8
Define a sample space.
A list of all possible outcomes of an event.
The probability of not rolling a 6 on a fair die.
5/6
Find the median of 3, 5, 7, 9, 11, 13.
8
A value that is much bigger or smaller than the rest of the data is called this.
outlier
What is the formula for finding probability of an event?
P(E) = number of favourable outcomes /total number of outcomes
List all possible outcomes if you spin two coins
HH TT TH HT
The complement of an event is found by subtracting the probability of the event from this number.
1
This is found by subtracting the smallest value from the largest value.
range
True/ false
A data set is positively skewed if its tail points to the right.
True