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2 years ago

11

Helpppppppppppppppppppppppp plz

2 answers:

weeeeeb [17]2 years ago

4 0

???there is nothing ???

vovangra [49]2 years ago

3 0

Answer:

you dont have a url ink i cant help you

Explanation:

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2 years ago

If an atom has 17 protons, 16 neutrons, and 21 electrons, what is the atom's electrical charge? A. -1 B. -4 C. +5 D. +4

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3 years ago

To whom do you wish to enroll in a college savings plan

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What is the main reason that attitudes are more often revealed in spoken rather than written language?

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2 years ago

In a study of helicopter usage and patient survival, among the 56,074 patients transported by helicopter, 235 of them

xxMikexx [17]

Using the hypergeometric distribution, it is found that the probability is 0.845 = 84.5%.

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The patients are chosen from the sample without replacement, which means that the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

The probability of x successes is given by:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

The parameters are:

x is the number of successes.
N is the size of the population.
n is the size of the sample.
k is the total number of desired outcomes.

Combination formula:

is the number of different combinations of x objects from a set of n elements, given as:

$C_{n,x} = \frac{n!}{x!(n-x)!}$

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56074 patients, thus $N = 56074$
Sample of 40, thus, $n = 40$
235 left against medical advice, thus, $k = 235$ .

The probability that none left against medical advice is P(X = 0), so:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 0) = h(0,56074,40,235) = \frac{C_{235,0}*C_{55839,40}}{C_{56074,40}} = 0.845$

The probability is 0.845 = 84.5%.

A similar problem is given at brainly.com/question/24008577

6 0

2 years ago