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3 years ago

Evaluate the expression 12-(8+3)

Mathematics

2 answers:

kvasek [131]3 years ago

4 0

This is equal to 12-11, so the answer is 1.

lutik1710 [3]3 years ago

3 0

The answer is 1. Needs to be 20 chars.

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The delivery times for all food orders at a fast-food restaurant during the lunch hour are normally distributed with a mean of m

UkoKoshka [18]

Answer:

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:

$X \sim N(14.7,3.7)$

Where $\mu=14.7$ and $\sigma=3.7$

Since the distribution of X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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

And we have;

$\mu_{\bar X}= 14.70$

$\sigma_{\bar X} =\frac{3.7}{\sqrt{40}}= 0.59$

Step-by-step explanation:

Assuming this question: The delivery times for all food orders at a fast-food restaurant during the lunch hour are normally distributed with a mean of 14.7 minutes and a standard deviation of 3.7 minutes. Let R be the mean delivery time for a random sample of 40 orders at this restaurant. Calculate the mean and standard deviation of $\bar X$ Round your answers to two decimal places.

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:

$X \sim N(14.7,3.7)$

Where $\mu=14.7$ and $\sigma=3.7$

Since the distribution of X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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

And we have;

$\mu_{\bar X}= 14.70$

$\sigma_{\bar X} =\frac{3.7}{\sqrt{40}}= 0.59$

4 0

3 years ago

What number is 37 1/2% of 32?

Serggg [28]

37.5% of 32 is 12

if you move the decimal point in the percentage 2 places to the left you will get a number you can multiply with

so 0.375 x 32 = 12

6 0

3 years ago

Plz help I will mark you brainlist plz help

lakkis [162]

Answer

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Step-by-step explanation:

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8 0

3 years ago

Read 2 more answers

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Valentin [98]

Large=40 pounds

small=30 pounds

and this is the solution

3 0

2 years ago

HELP ASAP!!!! WILL GIVE BRAINLIEST Factor 14f + 21 using the GCF

Mkey [24]

Answer:

Step-by-step explanation:

5 0

3 years ago