VS - porazdelitve Flashcards

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1
Q

Indikator dogodka

A

Bernoullijeva
Be(p)

P(X = 0) = 1 − p
P(X = 1) = p

E(X) = p

D(X) = pq

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2
Q

Stevilo uspešnih izidov v n
neodvisnih poskusih;
vsota n neodvisnih Bernoullijevih sl. spr

A

Binomska
B(n, p)

P(X = k) = (n | k)p^k * q^(n-k)

E(X) = n*p

D(X) = npq

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3
Q

Število poskusov do prvega

uspešnega izida

A

Geometrijska
G(p)

P(X = k) = pq^(k−1)

E(X) = 1/p

D(X) = q/p^2

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4
Q

Število poskusov do n-tega
uspešnega izida; vsota n
neodv. geom. sl. spr.

A

Pascalova
P(n, p)
P(X = k) = (k - 1 | n - 1) * p^n * q^(k - n)

E(X) = n/p
D(X) = (n*q)/p^2
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5
Q

Stevilo telefonskih klicev,
nesreče ipd. v
določenem času

A

Poissonova
P(λ)

P(X = k) = (λ^k * e^(-λ))/k!

E(X) = λ
D(X) = λ
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6
Q

Faza periodičnega pojava

A

Enakomerna na
intervalu
E[a, b]

px(x) = 1/(b - a)

E(X) = (a + b)/2
D(X) = (b - a)^2/12
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7
Q

Normalna

A

N(µ, σ)

E(X) = µ
D(X) = σ^2
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8
Q

Čas prvega klica, življenjska doba radioaktivnega delc

A

Eksponentna
Exp(λ)

E(X) = 1/λ
D(X) = 1/λ^2
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9
Q

Kovarianca za X in Y

A

Cov(X, Y) = E(XY) - E(X)*E(Y)

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10
Q

formula za disperzijo

A

D(X) = E(X^2) - E(X)^2

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11
Q

Formula za matematično upanje oz. pričakovano vrednost.

Povprečna vrednost spremenljivke

A

E(X) = (i = 0 do n)Σxi * pi

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12
Q

Koliko je P(a < x < b) za diskeretno slučajno spremenljivko?

A

P(a < x < b) = Fx(b) - Fx(a)

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13
Q

Koliko je P(a < x < b) za zvezno slučajno spremenljivko?

A

P(a < x < b) = (integarl from a to b) p(x) dx

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14
Q

Cov (X, X)?

A

D(X)

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15
Q

koliko je standardni odklon σ

A

√(D(X))

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16
Q

Kombinacije brez ponavljanja

A

(n | k) = (n * n-1 * n-2 * …* n-k+1)/k!

17
Q

Kombinacije s ponavljanjem

A

(( n | k )) = (n+k-1 | k)

18
Q

Permutacije s ponavljanjem

A

n!/(k1! * k2!..)

k1, k2 so število enakih elementov

19
Q

Variacije s ponavljanjem

A

n^k

razporeditev n elementov na k mest