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enot [183]
2 years ago
15

A weighted average of the value of a random variable, where the probability function provides weights, is known as _____. a. a p

robability function b. a random variable c. the expected value d. None of the answers is correct.
Mathematics
1 answer:
alexandr402 [8]2 years ago
8 0

Answer:

The answer is c. The expected value.

Step-by-step explanation:

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The length of a rectangle is twice the with. If the perimeter of the rectangle is 60 units, find the area of the garden
Darya [45]

w - width

2w - length

60 - perimeter

w + w + 2w + 2w = 6w - perimeter

The equation:

6w = 60    <em>divide both sides by 6</em>

w = 10 → 2w = 2 · 10 = 20

The area: A = width × length

A = (10)(20) = 200

<h3>Answer: The area of the garden is equal 200 square units.</h3>
4 0
2 years ago
Product of 7.69×5 be greater or less than its estimate of 8×5?
spayn [35]

The product is a bit less than the estimate. In fact, 7.69 is less than 8, and if you start with an equality, i.e.

7.69 < 8

you can multiply both sides by a positive number, and the inequality will still hold:

7.69 \cdot 5 < 8 \cdot 5

8 0
3 years ago
What is the solution to the inequality lx-4l&lt; 3? –7 &lt; x &lt; –1 1 &lt; x &lt; 7 x &lt; –7 or x &lt; –1 x &gt; 1 or x &lt;
lidiya [134]

1

So, Option B is correct.

Step-by-step explanation:

We need to solve the inequality: |x-4|< 3

Solving:

|x-4|< 3

The absolute rule says that if |u|<a and a>0, then -a<u<a

So, applying absolute rule:

|x-4|< 3\\-3

We can write it as:

x-4>-3\,\,and\,\,x-4-3+4\,\,and\,\,x1\,\,and\,\,x

Combining the intervals:

1

So, Option B is correct.

Keywords: Solving inequalities

Learn more about Solving inequalities at:

  • brainly.com/question/1465430
  • brainly.com/question/6703816
  • brainly.com/question/11788572
  • brainly.com/question/4192226

#learnwithBrainly

5 0
3 years ago
Read 2 more answers
In order for a vaccine to be effective, it should reduce a person's chance of acquiring a disease. Consider a hypothetical vacci
Dmitrij [34]

Answer:

Step-by-step explanation:

Let assume that Suppose the chance of contracting malaria is 10% for those who are not vaccinated ;   (since the value) is not given.

Thus;

If the vaccine has no effect, risk of malaria for vaccine and no vaccine are equal to 0.1

Probability of not getting malaria if vaccinated or no vaccinated = 1 - 0.1 = 0.9

                          Malaria                No Malaria               Total

Vaccinated     100 * 0.1 = 10        100 * 0.9 = 90                         100

No Vaccine     200 * 0.1 = 20   200 * 0.9 = 180        300-100 = 200

Total                 20 + 10 = 30       90 + 180 = 270                       300

If the vaccine cuts the risk by half, risk of malaria for vaccinated are equal to 0.1/2 = 0.05

Probability of not getting malaria if vaccinated = 1 - 0.05 = 0.95

                          Malaria                No Malaria               Total

Vaccinated     100 * 0.05 = 5         100 * 0.95 = 95                 100

No Vaccine     200 * 0.1 = 20   200 * 0.9 = 180        300-100 = 200

Total                 20 + 5 = 25       90 + 180 = 275                         300

3 0
3 years ago
A biologist is researching the population density of lizards near a boulder in a desert. The biologist
melamori03 [73]

Answer:

76

Step-by-step explanation:

Use .25 to represent the 1/4 of a mile.

Since it is a given radius around the boulder, we would treat it as such and find the area of the circle around the boulder.

To do this, you do .25² * 3.14

.0625 * 3.14 = .19625

15/.19625 = 76 and some change, but you need to round down to 76

Answer is 76.

3 0
3 years ago
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