The Laplace High School basketball team has a probability of 1/2 of winning a game, independent of previous games. The probabili

Question

The Laplace High School basketball team has a probability of 1/2 of

winning a game, independent of previous games. The probability

that, in a sequence of 8 games, the team wins two of its last four

games and four of its eight games can be expressed in lowest

terms as 7. What is a + b?

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Nem 5 months 2021-08-14T05:03:56+00:00 1 Answers 4 views 0

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    0
    2021-08-14T05:05:15+00:00

    Answer:

    a= 1/2 and b= 1/2

    Step-by-step explanation:

    The given probability can be expressed in the form of binomial expansion  where a= p and b= q

    Therefore a= 1/2 and b= 1/2

    For n= 8 trials the binomial expansion can be written as

    [ p+q] ^n = [ 1/2+1/2]^8

    =(1/2)^0(1/2)^8 +8C1(1/2)^7(1/2)+8C2(1/2)^6(1/2)^2+8C3(1/2)^5(1/2)^3+8C4(1/2)^4(1/2)^4+8C5(1/2)^3(1/2)^5+8C6(1/2)^2(1/2)^6+8C7(1/2)(1/2)^7+8C8(1/2)^0(1/2)^8

    =

    1(1/2)^0(1/2)^8 +8(1/2)^7(1/2)+28(1/2)^6(1/2)^2+56(1/2)^5(1/2)^3+70(1/2)^4(1/2)^4+56(1/2)^3(1/2)^5+28(1/2)^2(1/2)^6+8(1/2)(1/2)^7+1(1/2)^0(1/2)^8

    =

    1/(2)⁸ { 1+ 8+28+56+70+56+28+8+1}

    = 1/(2)⁸ {256}

    = 1

    The total probability is always 1.

    Also P+q= 1

    1/2+1/2= 1

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )