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4 years ago

Pls help with answer

Mathematics

2 answers:

insens350 [35]4 years ago

8 0

2y+x=-15
x=3y
2y+3y=-15 - subsitution
5y=-15 - addition
y=-3 - division

Strike441 [17]4 years ago

7 0

2y+3y=-15
5y=-15
Y=-3

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Blood type AB is the rarest blood type, occurring in only 4% of the population in the United States. In Australia, only 1.5% of

Naddik [55]

Answer:

There is a 27.62% probability that exactly 2 of the U.S. residents have blood type AB.

Step-by-step explanation:

For each U.S. resident, there are only two outcomes possible. Either they have blood type AB, or they do not. This means that we can solve this problem using binomial probability distribution concepts.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$

In which $C_{n,x}$ is the number of different combinatios of x objects from a set of n elements, given by the following formula.

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

And $\pi$ is the probability of X happening.

In this problem, we have that:

50 U.S residents are sampled, so $n = 50$

4% of the U.S population has blood type AB, so $p = 0.04$ .

What is the probability that exactly 2 of the U.S. residents have blood type AB?

This is P(X = 2). So:

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$

$P(X = 2) = C_{50,2}.(0.04)^{2}.(0.96)^{48} = 0.2762$

There is a 27.62% probability that exactly 2 of the U.S. residents have blood type AB.

5 0

3 years ago

What 34,920 rounded to the ten thousand and // 850,471 rounded to hundred thousands

CaHeK987 [17]

Answer is 30000 and 900000

4 0

3 years ago

Read 2 more answers

27,643,087 round to the nearest million

Maksim231197 [3]

If the number before the place you are rounding to is a 5 or more you round up but if it is a 4 or below it stays the same so the answer is 28,000,000

4 0

3 years ago

What are the factors of 37, 51, and 45? i just dont get it

o-na [289]

45=1,3,5,9,15,45 37=only 1 and 37 because it is prime. 51= 1,3,17,51

3 0

3 years ago

What is the smaller number -1, 3, 7, 9, or 11.

Vsevolod [243]

Hey there!

<h2>ANSWER: $-1$ </h2><h2>EXPLANATION:</h2>

$\text{What is the smallest number?: -1,3,7,9,11}$

All numbers are positive except -1. If a number is negative, then that negative number will be less than a positive. All are positive and -1 is negative. Since that's the only negative, -1 is the smallest number.

$-1\text{ is the smallest number.}$

Hope this helps!

$\text{Please rate this answer, or mark brainliest, and don't forget to thank!}\\\text{-TestedHyperr}$

6 0

3 years ago