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3 years ago

HELPPPPPPPPPPPP With this question ( taking quiz)

Mathematics

2 answers:

Serggg [28]3 years ago

7 0

You are correct, it is a water bottle

creativ13 [48]3 years ago

3 0

Answer:

swimming pool

Step-by-step explanation:

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A multiple-choice examination has 20 questions, each with five possible answers, only one of which is correct. Suppose that one

kari74 [83]

Answer:

The probability that the student answers at least seventeen questions correctly is $8.03\times 10^{-10}$ .

Step-by-step explanation:

Let the random variable X represent the number of correctly answered questions.

It is provided all the questions have five options with only one correct option.

Then the probability of selecting the correct option is,

$P(X)=p=\frac{1}{5}=0.20$

There are n = 20 question in the exam.

It is also provided that a student taking the examination answers each of the questions with an independent random guess.

Then the random variable can be modeled by the Binomial distribution with parameters n = 20 and p = 0.20.

The probability mass function of X is:

$P(X=x)={20\choose x}\ 0.20^{x}\ (1-0.20)^{20-x};\ x =0,1,2,3...$

Compute the probability that the student answers at least seventeen questions correctly as follows:

$P(X\geq 17)=P (X=17)+P (X=18)+P (X=19)+P (X=20)$

$=\sum\limits^{20}_{x=17}{{20\choose x}\ 0.20^{x}\ (1-0.20)^{20-x}}\\\\=0.00000000077+0.000000000032+0.00000000000084+0.000000000000042\\\\=0.000000000802882\\\\=8.03\times10^{-10}$

Thus, the probability that the student answers at least seventeen questions correctly is $8.03\times 10^{-10}$ .

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3 years ago

What is the product?

SSSSS [86.1K]

All you have to do is use a caculater

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3 years ago

Read 2 more answers

Use the properties of exponents to determine the value of a for the equation:

sleet_krkn [62]

Answer:

You need to do 1x to the 3rd power and then do the x with the division sign on a calculator. After those two steps divide the answer for 1x to the 3rd power by the x with the division sign. Then the answer that you get will most likely be the answer for a.

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2 years ago

What is (-s - 5) + (-2s + 2)?

Studentka2010 [4]

The answer is (−3s-3)

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3 years ago

62 is 90.5% of what number? _ Round to the nearest tenth.

Nuetrik [128]

About 68.5. Hope this helps :)

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3 years ago