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Zielflug [23.3K]
3 years ago
14

PLZ HELP ME!!!!!! ASAP!! PLZ EXPLAIN YOUR ANSWERS THOROUGHLY!! giving 20 points

Mathematics
1 answer:
vredina [299]3 years ago
4 0
The answer would be C because the inequality is greater than 70 but less then 80.
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mariarad [96]
PEMDAS

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3 0
3 years ago
Read 2 more answers
The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is 2643 miles, with a standard
musickatia [10]

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
WILL GIVE BRAINLIEST ASAP!!
Inga [223]

Answer: A) 1888 B) 664.225 C)?

Step-by-step explanation:

A= 42+76(1/2) = 59

59(32)=1888

A=163/10(163/4)=664.225

3 0
3 years ago
A+b/a-b = 5/3 what are the following ratios? b:a
klio [65]

Answer:

b : a = 1 : 4

Step-by-step explanation:

<em>\frac{ a + b}{ a - b} = \frac{5}{3}</em>

<em>3 ( a + b) = 5 ( a - b)</em>

<em>3 a + 3 b = 5 a - 5 b</em>

<em>5 b + 3 b = 5 a - 3 a</em>

<em>8 b = 2 a</em>

<em>\frac{b}{a} = \frac{2}{8}</em>

b : a = 1 : 4

7 0
3 years ago
I need help no one helps me never
emmainna [20.7K]

Answer:

E

Step-by-step explanation:

they all equal the same thing

hope this helps :)

8 0
3 years ago
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