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scZoUnD [109]
3 years ago
9

Samantha took a survey of the students in her grade to see how many are likely to join a knitting club if she starts one. She su

rveyed 24 students, and 12 said they would join. If there are 300 students in her grade, about how many students would you expect to join the knitting club?
Mathematics
1 answer:
Rashid [163]3 years ago
4 0

Answer:

150 students are expected to join the knitting club

Step-by-step explanation:

Here is an experimental probability question. We are trying to move from the specific to the general case.

Firstly, we need to calculate the probability that a student will join the knitting club given the pointers we can obtain from the survey.

From the survey, 12 will join out if 24. Thus, this probability is equal to 12/24 = 1/2

Now in a case where we are having 300 students, our probability still stands. What we now need to look for is that number out of 300 that will give us the 1/2 probability we had earlier.

Mathematically, that is equal to 1/2 * 300 = 150 students

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A container manufacturer plans to make rectangular boxes whose bottom and top measure x by 4x. The container must contain 12ft^3
zheka24 [161]

The height of the container should be equal to 2.57 cm, so as to minimize cost.

<h3>How to calculate the height?</h3>

First of all, we would determine the volume of the rectangular container by using this formula:

Volume = l × w × h

Where:

  • l represents the length.
  • w represents the width.
  • h represents the height.

Substituting the given parameters into the formula, we have;

Volume = x × 4x × h

Volume = 4x²h

At a volume of 12 ft³, we have:

12 = 4x²h

h = 12/4x²

h = 3/x²

For the total area of top and bottom, we have:

Area = (x × 4x) + (x × 4x)

Area = 4x² + 4x²

Area = 8x² sq. units.

Thus, the cost of top and bottom is given by:

Cost = 8x² × 1.50

Cost = $12x²

For the total area of all four sides, we have:

Area = (x × h) + (x × h) + (4x × h) + (4x × h)

Area = xh + xh + 4xh + 4xh

Area = 10xh sq. units.

Thus, the cost of all four sides is given by:

Cost = 10xh × 4.50

Cost = $45xh.

Also, the cost function would be given by:

C(x) = 12x² + 10xh

C(x) = 12x² + 10x(3/x²)

C(x) = 12x² + 30/x

Taking the first derivative, we have:

dC/dx = 24x - 30/x²

24x = 30/x²

24x³ = 30

x³ = 30/24

x = 1.08

Therefore, the height will be:

h = 3/x²

h = 3/1.08²

h = 3/1.1664

Height, h = 2.57 cm.

Read more on minimum height here: brainly.com/question/27308167

#SPJ1

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2 years ago
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