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zhenek [66]
3 years ago
8

Find the value of X

Mathematics
1 answer:
iren2701 [21]3 years ago
3 0
The answer is x equals 17
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Find the value of 5x - 4x^2 for x=2
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Answer:

=10

Step-by-step explanation:

5x-4x². (x=2)

5(2)-4(2)²

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2 years ago
An instructor who taught two sections of engineering statistics last term, the first with 20 students and the second with 30, de
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Answer:

(a) P(X=10) = 0.2070

(b) P(X\geq 10) = 0.3798

Step-by-step explanation:

Note that in this problem we have an initial population N = 50, of which 30 fulfill a certain characteristic "m" (belong to the second section). Then, from the population N, a sample of size n = 15 is selected and it is desired to know how many comply with the desired characteristic (second section).

So

Let X be the number of projects in the second section, then X is a discrete random variable that can be modeled by a hypergeometric distribution.

(a)

Therefore, to answer question (a) we use the following equation presented in the attached image:

Where:

N = 50\\m = 30\\n = 15\\X = 10

Then:

P (X = 10) = \frac{\frac{30!}{10!(30-10)!}\frac{20!}{5!(20-5)!}}{\frac{50!}{15!(50-15)!}}\\\\\\P(X=10) = 0.2070

(b)

For part (b) we have:

P(X\geq10) = 1-P(X

P(X\geq 10) = 1-0.6202 \\\\P(X\geq 10) = 0.3798

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Step-by-step explanation:

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