Algebra 2
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Experimental v. Theoretical Probability
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To find the Expected Value of an event,
multiply the number of trials by the
theoretical probability of the event.
If you flip a coin 80 times, how many heads
would you expect to get?
80 flips * (.5 probability of a head)
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A permutation is an arrangement of items in a
particular order.
The multiplication counting rule states that the
number of ways to choose n items is:𝑛 𝑛 − 1 𝑛 −
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For permutations, the order of the events is
important (first, second, third place)
If order is not important, then you calculate
combinations instead.
Find P(heavy snow and school is open)
Find P(school is open, given heavy snow)
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On 28% of days, the sky is mostly clear.
On mostly clear days, it rains 4% of the time.
On cloudy days, it rained 31% of the time.
Construct a tree diagram.
Find the probability that it rains on a day
when it is mostly clear.
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Find the outlier
F
• Find the z score for a value of 97
• Find the z score for a value of 67