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3 years ago

PLS HELP ASAP ITS DUE IN 2HR PLS

Mathematics

1 answer:

iragen [17]3 years ago

5 0

Answer:

From 10 a.m. to 2 p.m., the temperature at Sam's house increased by 8 degrees Fahrenheit.

Step-by-step explanation:

Write as a number equation ----> 2 - (-6) = 8

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Regina's average balance checking account pays simple interest of 3.6% annually, and she made $2.31 in interest last month. What

BlackZzzverrR [31]

3.6%/12=0.3% monthly
Balance last month
2.31/0.003=770

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3 years ago

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Which statement BEST explains the role of DNA in the growth and specialization of an organisms?

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2 years ago

What is the value of n In the following 100 : 500 = n : 5

mrs_skeptik [129]

Step-by-step explanation:

ratio means over so,

100 = n

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3 years ago

-2•(-6) what is the answer

Umnica [9.8K]

12.

Start of with simply two times six, which is twelve. Since they're both negatives, they cancel each other out and become positive.

Hope this helps!

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3 years ago

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g If a random sample of 18 deliveries was selected instead and the standard deviation of these delivery times was found to be 9.

lana [24]

Answer:

We can use the z score formula given by:

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

If we use this formula we got:

$z=\frac{21-20}{\frac{9.31}{\sqrt{18}}}= 0.456$

$z=\frac{25-20}{\frac{9.31}{\sqrt{18}}}= 2.279$

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

$P(0.456$

Step-by-step explanation:

We assume this previous info: It is known that the amounts of time required for room-service delivery at a certain Marriott Hotel are Normally distributed with the average delivery time of 20 minutes.

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".

Solution to the problem

Let X the random variable that represent the delivery times of a population, and for this case we know the distribution for X is given by:

$X \sim N(20,9.31)$