Monday, June 18, 2012

Definitions Relevant To Central Tendency

Mean: The sum of a set of values divided by the number of values in a set.

Median: The middle number of a data set after the data has been arranged in order.

Mode: The most frequently occurring number in a data set.

Range: The positive difference between the largest and smallest values in a data set.

Outlier: A value that is much larger or smaller than the other data values.

Definitions Relevant To Probability

Probability: The chance of an event occurring.

Outcome: One possible result of a probability experiment.

Favourable Outcome: A successful result in a probability experiment.

Independent Event: The outcome of one event that has no effect on the outcome of another event.

Sample Space: All possible outcomes of an experiment.

Random: An event in which every outcome has an equal chance of occurring.

Theoretical Probability: The expected outcome of an event happening.

Experimental Probability: The probability of an event occurring based on experimental results.

Sunday, June 17, 2012

Experimental Probability

Experimental probability is when you do an experiment and get results from the experiment, whether or not they differ from the theoretical probability.


Divisible means when a number can be divided by another number with no remainders/ it is a whole number.

The divisibility rules

The rules show when a number is divisible by that number
0- when the number ends in 0
1- All numbers
2- All even numbers
3- If the sum of all the digits equal to something that can be divided by 3, it is.
4- It's divisible by two twice
5- If it ends in 5 or 0.
6- If it is divisible by 2 and 3
8- If divisible by 2 thrice.
9- If the sum of the digits is divisible by 9
10- ends in 0

An outlier

An outlier is a number that is either too small or too big compared to other numbers in a data set.
e.g 5, 5, 6, 7, 1000
The outlier is 1000


The range of a data set is when you subtract the smallest value from the biggest value.
E.g 4, 5, 6, 7
7 - 4 = 3
The range is 3