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sineoko [7]
3 years ago
6

Y varies directly with x, and y = 15 when x = 3. What is the value of x when y = 4?

Mathematics
1 answer:
Naddika [18.5K]3 years ago
8 0
3/15 = x/4
cross multiply
15x = (4)(3)
15x = 12
x = 12/15
x = 4/5 <==
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Answer:

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Complete Problem Statement:

In a binomial experiment with 45 trials, the probability of more than 25 successes can be approximated by P(Z>\frac{(25-27)}{3.29})

What is the probability of success of a single trial of this experiment?

Options:

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Step-by-step explanation:

So to solve this, we need to use the binomial distribution. When using an approximation of a binomially distributed variable through normal distribution , we get:

\mu =\frac{np}{\sigma}=\sqrt{np(1-p)}

now,

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so,

by comparing with P(Z>\frac{(25-27)}{3.29}), we get:

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\sigma=\sqrt{np(1-p)} =3.29

put np=27

we get:

\sigma=\sqrt{27(1-p)} =3.29

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Answer:

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Step-by-step explanation:

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Now, factor out 2b from the right side:

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Divide both sides by 2(a + c):

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