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3 years ago

5

Two fifths of the instruments in the marching band are brass, one third are woodwinds. One eighth of the brass instruments are t

ubas. If there are 240 instruments in the band, how many are tubas?

1 answer:

Rom4ik [11]3 years ago

3 0

Do 11/24 + 2/5. then subtract your answer from 240

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Step-by-step explanation:

The binomial distribution formula for probability :-

$P(x)=^nC_xp^x(1-p)^{n-x}$ , where P(x) is the probability of getting success in x trials , n is the total number of trials and p is the probability of getting success in each trial.

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$P(x>5)=P(6)+P(7)+P(8)\\\\=^8C_6(0.33)^6(0.67)^{2}+^8C_7(0.33)^7(0.67)^{1}+^8C_8(0.33)^8(0.67)^{0}\\\\=(\dfrac{8!}{6!2!})(0.33)^6(0.67)^{2}+(8)(0.33)^7(0.67)^{1}+(0.33)^8(0.67)^{0}\\\\=0.0186577086013\approx0.0187$

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Hope this Helps! :)

Have a nice day! :)

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