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Simora [160]
2 years ago
6

The probability a person is infected by a certain cold virus is 0.2. If a random sample of 12 people is taken, what is the proba

bility that at least one person will be infected by the cold virus?
Mathematics
1 answer:
inna [77]2 years ago
3 0

Answer:

If 0.2 = 20%, The probability that 1 person will be infected is 100%, according to theory.

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Veronika [31]

Answer:

d

Step-by-step explanation:

7 0
3 years ago
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Find the value of x. Round to the nearest tenth.
Sphinxa [80]

Answer:

14.86854, or 15

Step-by-step explanation:

3 0
2 years ago
Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth. −6y2 − 9y = −1
Tomtit [17]
-6y^2 - 9y = -1

y= \dfrac{-9+ \sqrt{9^2-4*-6} }{2*6}, \dfrac{-9-\sqrt{9^2-4*-6}}{2*6}


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8 0
3 years ago
A marketing firm is asked to estimate the percent of existing customers who would purchase a "digital upgrade" to their basic ca
Ugo [173]

Answer: A. 664

Step-by-step explanation:

Given : A marketing firm is asked to estimate the percent of existing customers who would purchase a "digital upgrade" to their basic cable TV service.

But there is no information regarding the population proportion is mentioned.

Formula to find the samples size , if the prior estimate to the population proportion is unknown :

n=0.25(\dfrac{z*}{E})^2

, where E = Margin of error.

z* = Two -tailed critical z-value

We know that critical value for 99% confidence interval = z*=2.576  [By z-table]

Margin of error = 0.05

Then, the minimum sample size would become :

n=0.25(\dfrac{2.576}{0.05})^2

Simplify,

n=0.25\times2654.3104=663.5776\approx664

Thus, the required sample size= 664

Hence, the correct answer is A. 664.

5 0
3 years ago
Pls help me with this math<br> 6(2b-4) when b=5?
skad [1K]

Answer:

36

Step-by-step explanation:

6(2b - 4)

~Substitute

6(2(5) - 4)

~Simplify

6(10 - 4)

~Subtract in parenthesis

6(6)

~Multiply

36

Best of Luck!

4 0
3 years ago
Read 2 more answers
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