Lesson 1.6
Probability
• Probability measures how likely it is for an
event to occur.
• You can express probabilities as percents (0%
through 100%) or as real numbers (0 through 1)
• 50% or ½
75% or ¾
• When you gather data from observations you
can calculate an experimental probability.
• Each observation is a trial
• Experimental probability = P(event)=
number of times the event occurs
number of trials
• When actual trials are difficult to conduct, you
can find experimental probabilities by using a
simulation.
• Simulation – a model of one or more events
• Sample Space – set of all possible outcomes.
• What is the sample space when you roll a
cube.
• Theoretical Probability = favorable outcomes
Total outcomes
• What is theoretical probability of rolling a two
on a six sided dice.
• Quick check examples 1,2 and 4
• Assignment: