2 years ago

7. If a = 3 and b = -1, find the value of 2a - 2b.

Mathematics

1 answer:

Ber [7]2 years ago

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Answer:

hola bolilla cómo andas e bueno ay te gachas

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a) $E(X) = 6.45$

b) $E(X^{2} )= 57.25$

c) $V(X) = 15.648$

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Step-by-step explanation:

a) $E(X) = \sum xP(x)$

$E(X) = (1*0.05) + (2*0.10) + (4*0.35) + (8*0.40) + (16*0.10)\\E(X) = 6.45$

$E(X^{2} ) = (1^{2} *0.05) + (2^{2} *0.10) + (4^{2} *0.35) + (8^{2} *0.40) + (16^{2} *0.10)\\ E(X^{2} )= 57.25$

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$V(X+1) = 1^{2} V(X)\\V(X+1) = 15.648$

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