Probability grades 1-9

Probability grades 1-9

1. Basics

   • all probabilities are between 0 and 1
     • -probabilities are always between 0 and 1.
       • the higher the probability of something , the more likely it is.
         • A probability of 0 means it will never happen.
           • A probability of one means it will defiantly happen.
   • you can show the probability of something on a scale from 0 to 1. probabilities can be given as fractions, decimals or percentages.

2. use this formula when all outcomes are equally likely

   • use this formula to find probabilities for a fair spinner, coin or dice. a spinner /coin/dice is 'fair' when its equally likely to land on any of its sides .
     • probability= number of ways for something to happen divided by total number of possible outcomes

3. maths

   • mode,median,mean aand range
     • Mode= most common
       • median= middle value when in size order
         • mean= total of items divided by number of terms
           • range= difference between highest and lowest