Experimental Probability | MathHelp.com - Free Educational videos for Students in K-12 | Lumos Learning

Experimental Probability | MathHelp.com - Free Educational videos for Students in k-12


Experimental Probability | MathHelp.com - By MathHelp.com



Transcript
00:0-1 in the previous lesson we learned that we can find
00:02 the probability of an event . Using the ratio number
00:06 of favorable outcomes over total number of outcomes . For
00:10 example using the given spinner the probability of spinning a
00:14 . three is 1 4th because there's one favorable outcome
00:21 spinning at three and there are four possible outcomes 1234
00:27 and each outcome is equally likely . Since we found
00:30 this probability without actually spinning the spinner , it's called
00:35 the theoretical probability . In other words in theory there's
00:43 a one in four chance that will spend a .
00:45 three . We can also find the probability of a
00:49 given event by conducting an experiment . This is called
00:52 the experimental probability . For example we can find the
00:56 probability of spinning A . Three by actually spinning the
01:00 spinner and recording the results . I made a spinner
01:05 like the one on the board to conduct the experiment
01:08 . So let's spin the spinner 10 times and record
01:12 the results in the tallies column of our chart .
01:16 Yeah . Two yeah . Four . Yeah . Three
01:27 . Yeah . Three . Yeah . Two . Yeah
01:36 . One . Three . Yeah . One . Three
01:51 and one Now filling in the number of times column
01:56 . We can see that we spun a 13 times
02:00 . We spun at 2 2 times . We spent
02:04 a 3 , 4 times And we spent a 41
02:07 time . Finally in the fraction of total column we
02:12 put the number of times we spun each number over
02:15 the total number of spins which was 10 . So
02:18 we have 3/10 to over 10 , 4/10 And 1/10
02:30 . Now we can see that the experimental probability of
02:34 spinning at three was 4/10 Because we spun a 34
02:40 times out of a total of 10 spins , Notice
02:43 that 4/10 reduces to 2/5 . So the experimental probability
02:50 of spinning a three was to 5th .
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