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kirill115 [55]
3 years ago
12

22.5% written as a fraction in simplest form

Mathematics
1 answer:
umka2103 [35]3 years ago
3 0
The Answer would be 22/5. And that is hosw u will do it as a fraction in simplest form
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Step-by-step explanation:

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The mean life span of a brand name tire is 50,000 miles. Assume that the life spans of the tires are normally distributed, and t
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Answer:

a) P(X

b) P(\bar X>50200)=1-0.994=0.0062  

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

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X \sim N(\mu=50000,\sigma=800)  

Part a

We want this probability:

P(X

The best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X

Part b

Let \bar X represent the sample mean, the distribution for the sample mean is given by:

\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})

On this case  \bar X \sim N(50000,\frac{800}{\sqrt{100}})

We want this probability:

P(\bar X>50200)=1-P(\bar X

The best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

If we apply this formula to our probability we got this:

P(\bar X >50200)=1-P(Z

P(\bar X>50200)=1-0.994=0.0062  

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Step-by-step explanation:

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Answer:

C 16x-2+y

Step-by-step explanation:

we can split this into 3 terms with common denominator 3

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now divide each term

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