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ElenaW [278]
4 years ago
10

A contractor is considering a sale that promises a profit of ​$35 comma 000 with a probability of 0.7 or a loss​ (due to bad​ we

ather, strikes, and​ such) of ​$18 comma 000 with a probability of 0.3. What is the expected​ profit?
Mathematics
1 answer:
Nady [450]4 years ago
8 0

Answer:

$19,100

Step-by-step explanation:

The expected profit would be the probability of profit multiplied by the profit and the sum of probability of loss multiiplied by the loss.

So, we can say:

E(p) = P(p)*P + P(L)*L

Where

E(p) is expected profit

P(p) is probabilty of profit (0.7)

P is the profit (35,000)

P(L) is probability of loss (0.3)

L is the loss (-18,000)

Substituting these values, we get:

E(p) = P(p)*P + P(L)*L

E(p) = (0.7)(35,000) + (0.3)(-18,000)

E(p) = 19,100

The expected profit is $19,100

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Step-by-step explanation:

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4 0
3 years ago
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On the basis of sample of 25 students in a large campus laboratory, it appears that 8 students smoke. A 95% CI estimate of the p
artcher [175]

Answer:

a. [0.137, 0.503]

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence interval 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

A sample of 25 students in the lab, of whom 8 smoke. So n = 25, \pi = \frac{8}{25} = 0.32

95% confidence interval

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so z = 1.96.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.32 - 1.96\sqrt{\frac{0.32*0.68}{25}} = 0.137

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.32 + 1.96\sqrt{\frac{0.32*0.68}{25}}{119}} = 0.503

The correct answer is:

a. [0.137, 0.503]

3 0
3 years ago
25 points Helppppp nowwwwwwwww
koban [17]

Answer: Surface area = 392 in²

Step-by-step explanation:

It is divided into different sections as shown in the attached photo to aid explanation.

Looking at the attached photo

Area of A = 6 × 6 = 36 in²

Area of B = 4 × 10 = 40 in²

Area of the face containing A and B = 36 + 40 = 76 in²

Since the face is the same on the opposite end,

Area of the opposite end of AB = 76 in²

Area o C = 6 × 4 = 24 in²

Area of D = 6 × 6 = 36 in²

Area of E = 6 × 6 = 36 in²

Area of F = 6 × 4 = 24 in²

Area of base G = 10 × 6 = 60 in²

Area of back H = 6 × 10 = 60 in²

The surface area is the sum of all the faces of the given solid.

Therefore,

Surface area = 76 + 76 + 24 + 36 + 36 + 24 + 60 + 60 = 392 square inches

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4 years ago
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Step-by-step explanation:

If TR=SR=ST

SO,

all angles are equal

one angle =180/3=60°

but,here,

In angle S =60°

7x+4=60

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7x=56

x=56/7

x=8°

8 0
3 years ago
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Can you help me with this what is 4z-z
ValentinkaMS [17]

Answer: The answer would be 3z! Good luck!

Step-by-step explanation: Subract z from 4z, basically turn the equation to 4z - 1z, then put the variable (z) to the side and subtract 1 from 4. Once you're

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