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EastWind [94]
4 years ago
13

The employees of a firm that manufactures insulation are being tested for indications of asbestos in their lungs. The firm is re

quested to send two employees who have positive indications of asbestos to a medical center for further testing. If 40% of the employees have positive indications of asbestos in their lungs, find the probability that fifteen employees must be tested in order to find two positives. If each test costs $20, find the expected value in dollars and variance of the total cost of conducting the tests necessary to locate the two positives.

Mathematics
1 answer:
zubka84 [21]4 years ago
4 0

Answer:

0.0029; $26.6; $44.4

Step-by-step explanation:

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Pre-Calc help:
stepladder [879]

Answer:

8x^2+8y^2-79x-32y+95=0

Step-by-step explanation:

Let the equation be : x^2+y^2+2gx+2fy+c=0

The point (1,1) must satisfy this equation.

1^2+1^2+2g*1+2f*1+c=0\\2g+2f+c=-2---(1)

Similarly, the point (1,3) must satisfy:

1^2+3^2+2g*1+2f*3+c=0\\1+9+2g+6f+c=0\\2g+6f+c=-10---(2)

Also for the point (9,2), we have:

9^2+2^2+2g*9+2f*2+c=0\\81+4+18g+4f+c=0\\18g+4f+c=-85---(3)

Solving the equations (1), (2) and (3) simultaneously, we get:

g=-\frac{-79}{16},f=-2,c=\frac{95}{8}

We Substitute this values to get:

x^2+y^2+2(\frac{-79}{16})x+2(-2)y+\frac{95}{8}=0

x^2+y^2-(\frac{79}{8})x-4y+\frac{95}{8}=0

Multiply through by 8 to get:

8x^2+8y^2-79x-32y+95=0

8 0
3 years ago
Which shows two expressions that are equivalent to (Negative 7) (Negative 15) (Negative 5) Yan is climbing down a ladder. Each t
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Answer:

(-8) + (-8) + (-8) + (-8)

Step-by-step explanation:

Since Yan is descending ; we represent his movement as being negative.

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Given that no extra steps was taken ;

Number of ladder rungs descended :

4 rungs per stop for 8 stops

- 4 * 8 = - 32 rungs

Another way to write the product :

Number of stops added in number of rungs descended :

(-8) + (-8) + (-8) + (-8)

3 0
3 years ago
Any even number greater than 2 can make a sum of 2 prime numbers
guapka [62]

Answer:

yes

Step-by-step explanation:

8 0
3 years ago
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lianna [129]

Answer:

$152.33

Step-by-step explanation:

123.85 x 0.05 = $6.19

123.85 x 0.18 = $22.29

123.85 + 6.19 + 22.29 = $152.33

6 0
3 years ago
Help<br><br><br><br><br><br> 4/10 as a decimal
Rom4ik [11]
0.4 is 4/10 in decimal form.
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2 years ago
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