1. What is the difference between RELATIVE FREQUENCY and PROBABILITY.
Relative frequencies are usually obtained from experiments such as tossing a die 100 times or surveys, whereas probabilities are calculated from theory.
e.g Knowing that a normal coin will have a probability of 1/2 of coming up either heads or tails.
2. Can a probability be negative?
No. Probabilities always lie between (and including) 0 and 1.
An event with a probability of 1 is certain to happen.
An event with a probability of 0 is impossible.
3. What sort of problems do tree diagrams help to solve?
Tree diagrams are useful for solving problems involving probabilities and problems requiring the number of combinations available for a sequence of events.