## 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

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

### Range

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