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2.7 Random Variables Flashcards

(6 cards)

1
Q

Formula for variance

A

E(x^2) - E(x)^2

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2
Q

What is the bernoulli distribution

A

It is a complementary event (e.g. tossing a coin)
range of values {0, 1}
P(X = 1) = p
P(X = 0) = 1 - p

E(x) = p
var(x) = p(1 - p)

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3
Q

What is formula for expected and variance values for a binomial distribution

A

E(x) = np
var(x) = np(1-p)

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4
Q

What is p(X = k) for the poisson distribution?

A

(lamda^k)/k! * (e^-lamda)

lamda = np

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5
Q

what is e(x) and var(x) for poisson distribution

A

both lamda

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6
Q
A
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