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3 years ago

True or false

Mathematics

2 answers:

slavikrds [6]3 years ago

8 0

True, you have to purchase something to establish credit history.

Over [174]3 years ago

3 0

True, because you have to first buy something because you would have an account and then after a while you can get a loan or a phone bill to establish credit history.
Hope that helps! :)

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The incomes in a certain large population of college teachers have a normal distribution with mean $75,000 and standard deviatio

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Answer:

$P(\bar X >77500)=P(Z>\frac{77500-75000}{2500}=1)$

And using a calculator, excel ir the normal standard table we have that:

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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".

Solution for the problem

Let's say that X represent the random variable "incomes in a certain large population of college", and we know that the distribution for X is:

$X \sim N(\mu = 75000, \sigma= 10000)$

We select 16 teachers and we are interested on the sample mean or average, and we know that the distribution for the sample mean is given by:

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And we are interested on this probability:

$P(\bar X>77500)$

And we can use the z score given by:

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3 years ago

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Ksju [112]

Answer:

Step-by-step explanation:

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