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Helen [10]
3 years ago
13

[3×2⁵-13 ×(-2)] + 2³ ÷ (-2² +3²) -3

Mathematics
1 answer:
miskamm [114]3 years ago
8 0

Answer:

120.6  is the answer

Step-by-step explanation:

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Answer:

P(2643-51< \bar X < 2643+51)= P(2592< \bar X

And we can use the z scoe formula given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

And if we find the z score for the limits we got:

z = \frac{2592-2643}{\frac{368}{\sqrt{44}}}= -0.919

z = \frac{2694-2643}{\frac{368}{\sqrt{44}}}= 0.919

And this probability is equivalent to:

P(-0.919

Step-by-step explanation:

For this case we can define the random variable X as "number of miles between services" and we know the following info given:

\mu = 2643 , \sigma = 368

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

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

We select a random sample size of n =44. And we want to find this probability:

P(2643-51< \bar X < 2643+51)= P(2592< \bar X

And we can use the z scoe formula given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

And if we find the z score for the limits we got:

z = \frac{2592-2643}{\frac{368}{\sqrt{44}}}= -0.919

z = \frac{2694-2643}{\frac{368}{\sqrt{44}}}= 0.919

And this probability is equivalent to:

P(-0.919

4 0
3 years ago
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