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3 years ago

A box consists of 14 components, 5 of which are defective.

Mathematics

1 answer:

Irina-Kira [14]3 years ago

7 0

Answer:

a) Find P(X= 5) = 0.0004995

b) Find P(X= 5) = 0.0243

Step-by-step explanation:

The detailed steps and analysis is as shown in the attached file.

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Someone please help with A, B and C?

Sergeu [11.5K]

A.)

3×4=12; 12×4= 48; 48×2= 96; 96+1= 97

B.)

3×4=12; 12+4=16; 16×2= 32; 32+3=35

C.)

3×4=12; 12+4=16; 16×2= 32; 32+1=33

The answer is B

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3 years ago

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Show that (1 + 2V3)2 = 13 +4V3

Marta_Voda [28]

Answer:

(1+2V3)^2=13+4V3

<=> 1 +4V3 +12 = 13+4V3

<=> 1 +12 = 13

<=> 13=13

sorry if i wrong :(

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2 years ago

The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular st

Ipatiy [6.2K]

Answer:

We need a sample size of at least 101

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is needed to estimate the true average speed to within 2 mph at 99% confidence?

We need a sample of at least n.

n is found when M = 2. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$2 = 2.575*\frac{7.8}{\sqrt{n}}$

$2\sqrt{n} = 2.575*7.8$

$\sqrt{n} = \frac{2.575*7.8}{2}$

$(\sqrt{n})^{2} = (\frac{2.575*7.8}{2})^{2}$

$n = 100.85$

Rounding up

We need a sample size of at least 101

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3 years ago

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Len [333]

17/10 is what ur looking for

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4 years ago

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Maria has 7 gallons of water. Josh has 24 quarts of water. How many more cups of water does Maria have than Josh?

andriy [413]

Answer: Maria has 16 more cups of water than Josh

Step-by-step explanation:

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3 years ago

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