Monday, December 10, 2007

Experimental Probability

Definition of Experimental Probability
Experimental probability of an event is the ratio of the number of times the event occurs to the total number of trials.

Examples of Experimental Probability
Sam rolled a number cube 50 times. A 3 appeared 10 times.
Then the experimental probability of rolling a 3 is 10 out of 50 or 20%.

Solved Example on Experimental Probability
A coin is tossed 60 times. 27 times head appeared. Find the experimental probability of getting heads.
A. 1/27
B. 9/20
C. 1/60
D. 3/30
Correct Answer: B

Step 1: Experimental probability = number of times the event occurs / total number of trials.
Step 2: Number of times heads appeared = 27.
Step 3: Total number of experiments = 60.
Step 4: So, experimental probability of getting a head = 27/60. Then, you simplify and you get: 9/20.