Math Test Study
Mean, Mode, Median, Range
Mean
Definition: The average number of a database
Calculate:
1) Add all the numbers in the database
2) Divide the number into the number of category there are
Example: 4, 7, 9, 2, 5, 6, 7
Mean: 5.7
Mode
Definition: The number that appeared most
frequently in a database
Example
1) 7, 4, 5, 4, 3, 4
Mode: 4
2) 2, 6, 8, 4, 5, 9
Mode: No Mode
Median
Definition:
The middle number from the smallest number to the biggest in a database
Calculate:
1) Put the database into smallest to greatest
2) Find the middle number of the database
if the database is an even number, find the middle two numbers, add them together and divided by 2
Example
1) 1, 6, 5, 3, 4, 2, 7
Median: 4
2) 6, 5, 2, 4, 1, 3
Median: 3.5
Range
Definition: The smallest number to the greatest number in a database
Example: 1, 57, 83, 97, 20, 103
Range: 1-103
Broken Line Graph
Data: Cases in the word
Country Cases
US 8972121
Brazil 5411550
Canada 221040
India 7954502
France 1165278
Discrete & Continuous
Discrete
Definition: Data that can only take certain values.
Example:
1) Number of students in your class
2) Number of COVID-19 cases in the world
Continuous
Definition: Data that can take any values
Example:
1) Height of a dog
2) Weight of a cat
Primary & Secondary Data
Primary Data
Definition: Data was collected by yourself
Example:
1) The weight of my family members
2) The length of how many hours I sleep in a week
Secondary Data
Definition: Data was not collected by yourself
Example: (Usually collected by other)
1) The number of COVID-19 in Canada
2) The number of students that completed their homework
Interpret Data
Table
Chart
Interpret:
1) There is none in 50
2) There is only one in 100
3) There are 3 in 80
Charts
Charts
Interpret:
1)March had the most whales
2)June had the least dolphins
3)January had the least bears
Graph
Graph
Interpret:
1) Susan can hold the longest breath
2) Chris can hold the shortest breath
3) The range of this database is 10-90