probability functions Flashcards
1
Q
what is the relationship between cumulative probability density function and the probability density function?
A
cdf for a continuous random variable is found by integrating the pdf
∆ cdf= ∫pdf
or d/dx(cdf) = pdf
2
Q
cdf
A
F(x)
3
Q
A
f(x)
4
Q
how to find the median
A
where the restrctive inequalities are the upper and lower limits of the PDF
5
Q
how to find Q1
A
same thing as median but = to 0.25
6
Q
how to find Q3
A
same thing as median but = 0.75
7
Q
how to find mode
A
derive the PDF ≈ f’(x) = 0
to find the maximum and minimum points
then find the double derivate ≈ f”(x) and determine its nature
