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coldgirl [10]
3 years ago
14

Samatha has 80$ dollars in savings. She spends 1/4 of her money. How much money does she still have saved ?

Mathematics
1 answer:
patriot [66]3 years ago
3 0

80 * 1/4 = 80 /4 = 20

80-20= 60

 she has 60 dollars saved still

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BARSIC [14]

Answer:

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Answer:

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b)

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

c)

V(X) = E(X^{2} ) - (E(X))^{2} \\V(X) = 57.25 - 6.45^{2} \\V(X) = 15.648

d)

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e)

E(3X^{2} +2) = 3E(X^{2} ) + 2\\E(3X^{2} +2) = (3*57.25) + 2 \\E(3X^{2} +2) = 173.75

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g)

E(X+1) = E(X) + 1\\E(X+1) = 6.45 + 1\\E(X+1) =7.45

h)

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

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