If there are 3 events, and A and B are mutually exclusive... -
Answer>>P(A∪B∪C) = P(A) + P(B) + P(C) - P(A∩C) - P(B∩C)
What is a DRV - discrete random variable - Answer>>it is a
random variable that can only take certain values
... - Answer>>...
probability mass function - Answer>>a function that gives the
probability that a discrete random variable is exactly equal to
some value
what does a probability distribution do - Answer>>describes the
probability of any outcome in the sample space
P(A/B) = - Answer>>(P(A n B))
---------------
P(B)
If they are independent events P(A) * P(B) = - Answer>>P(A N
B)
SUM OF P(X=x) = - Answer>>1
, formula for probability X=r where X is the number of desired
outcomes
binomial distribution formula - Answer>>nCr P^r * (1-p)^(n-r)
p = probability of success
r = number of times you want success
n= number of trials
standard deviation - Answer>>a computed measure of how
much scores vary around the mean score
general probability addition rule - Answer>>P(A∪B)=P(A)+P(B)
−P(A∩B)
P(A∩B)=P(A)+P(B)−P(A∪B)
what is an event - Answer>>a set of possible outcomes - not
necessarily equally likely
sample space - Answer>>set of all possible outcomes , all
equally likely
A ∪ B - Answer>>means A or B or both
A ∩ B - Answer>>means both A and B
The rules for tree diagrams are - Answer>>Select which
branches you need
Multiply along each branch
Add the results of each branch needed.
Make sure that you include enough working to show which
branches you are using (method).
Be careful to allow for selection with and without replacement.
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