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3 years ago

Whats 2 plus 7 plus 3

Mathematics

1 answer:

likoan [24]3 years ago

6 0

Answer:

Hi, there your answer will 12

2+7+3=12

Have a nice day

Step-by-step explanation:

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10. A random sample of 10 fibers is taken from a collection of 92 fibers that consists of 43 fibers of polymer A, 17 fibers of p

vazorg [7]

Answer:

0.1150 = 11.50% probability that the sample does not contain any fibers of polymer B

Step-by-step explanation:

Hypergeometric distribution:

The probability of x sucesses is given by the following formula:

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

In which:

x is the number of sucesses.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

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

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

In this question:

Fibers are chosen without replacement, which means that we use the hypergeometric distribution.

92 fibers means that $N = 92$

Sample of 10 means that $n = 10$

No polymeter B which means that $x = 0$

17 fibers of polymeter B which means that $k = 17$

a. What is the probability that the sample does not contain any fibers of polymer B

This is P(X = 0).

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

$P(X = 0) = h(0,92,10,17) = \frac{C_{17,0}*C_{75,10}}{C_{92,10}} = 0.1150$

0.1150 = 11.50% probability that the sample does not contain any fibers of polymer B

4 0

3 years ago

Twenty times one hundred and one (20 x 101)

Dmitrij [34]

Answer:

2020

Step-by-step explanation:

2020

4 0

3 years ago

A charity is planning to raffle off a new car donated by a local car dealer. The charity wants to raise at least 65,000. It expe

MariettaO [177]

Answer:

they can sell 2000 tickets each ticket is worth 29.15

Step-by-step explanation:

65,000 - 5000 - 1700 = 58300

6 0

4 years ago

What is the surface area of a cube whose edges are 11 inches long? A. 66 square inches B. 660 square inches C. 726 square inches

Alex787 [66]

Answer:

C. 726 in^2.

Step-by-step explanation:

Each face has area 11^2 = 121 in^2 ( because each face is a square).

There are 6 faces so the total surface area = 6 * 121

= 726 in^2.

3 0

3 years ago

Read 2 more answers

Determine whether the following statements are true and give an explanation or counterexample.

Furkat [3]

Answer:

A) When using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. True.

The Shell method is a technique used to find the volume of a solid of revolution. Here, we take thin shells with axis coinciding with the axis about which the region whose volume is to be found, is revolved.

B) If a region is revolved about the y-axis, then the shell method must be used. False.

This method can be used with any axis of rotation.

C) If a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y. True.

The washer method uses thin disks with infinite width but the shell method uses thin concentric shells with infinite width about the axis of revolution. So, the statement is true.

5 0

3 years ago