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taurus [48]
3 years ago
5

A student guesses on every question of a​ multiple-choice test that has 9 ​questions, each with 3 possible answers. what is the

probability that the student will get at least 7 of the questions​ right
Mathematics
1 answer:
Ber [7]3 years ago
3 0
This is a binomial related problem. In this case,

P(correct) = p = 1/3
P(wrong) = q = 1-p = 1-1/3 = 2/3

The general formula for binomial is;
Summation [nCk(p)^k(q)^(n-k)]

Where
n = 9
k = 7,8,9

Substituting;
P(7≤X≤9) = [9C7(1/3)^7(2/3)^2]+[9C8(1/3)^8(2/3)^1]+[9C9(1/3)^9(2/3)^0] = [16/2187]+[2/2187]+[1/19683]=163/19683 ≈ 0.00828

Therefore, the  probability of getting atleast 7 question right is 0.00828.
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Answer:

the Europeans got the better deal from the Colombian Exchange

Step-by-step explanation:

In general, one would have to say that the Europeans got the better deal from the Columbian Exchange in that it facilitated the eventual establishment of colonies in the New World. That's not to say that it was all one-way traffic; however, the people of the New World undoubtedly benefitted in both the short and long-term by the introduction of crops and livestock. But such benefits proved to be more keenly felt by subsequent waves of European settlers than America's indigenous population.

After all, it wasn't much good for Native-Americans to have all these crops and all this livestock if, in due course, there'd be less land available for their use due to increased colonization. The indigenous peoples also suffered terribly from the introduction of diseases such as measles and smallpox, for which they had no natural immunity. It's difficult, then, to avoid the conclusion that the Europeans got the better deal from the Columbian Exchange (as it was probably intended that they should).

simply -

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Kono Dio Da!!!

7 0
4 years ago
See attachment to help.
GenaCL600 [577]
B.
because {1,1,3,5,8}
{2,2,4,6,9}

you're just counting the numbers after the one that was given to you.
3 0
3 years ago
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