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ivanzaharov [21]
3 years ago
8

Use the permutation formula to solve a problem when n = 8 and r = 4.

Mathematics
2 answers:
Feliz [49]3 years ago
8 0

Answer:

1680

Step-by-step explanation:

(,)=(8,4)

=\frac{8!}{(8-4)!}

=1,680

olganol [36]3 years ago
7 0
The answer is B which is 1,689
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foot locker uses sales per square foot as a measure of store productivity last year the mean annual sales per square foot was 39
lord [1]

Answer:

There is a 82% probability that th esample mean annual sales per square foot is at least $384.

Step-by-step explanation:

We have a population with mean 390 and standard deviation 45.83.

Samples of size n=49 are taken.

The parameters of the sampling distribution are:

\mu_s=\mu=390\\\\ \sigma_s=\dfrac{\sigma}{\sqrt{n}}=\dfrac{45.83}{\sqrt{49}}=\dfrac{45.83}{7}=6.547

First, we have to calculate the z-score that satisfies:

P(z>z^*)=0.82

This z-score, looked up in a standard normal distribution table, is z=-0.915.

Then, we can calculate the sample mean as:

M=\mu_s+z\cdot\sigma_s=390+(-0.915)\cdot 6.547=390-6=384

There is a 82% probability that th esample mean annual sales per square foot is at least $384.

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3 years ago
Find the absolute Value of -0.99
Leona [35]

Answer:

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Read 2 more answers
Find the TWO integers whos product is -12 and whose sum is 1
konstantin123 [22]

Answer:

\rm Numbers = 4 \ and \ -3.

Step-by-step explanation:

<u>Given </u><u>:</u><u>-</u><u> </u>

  • The sum of two numbers is 1 .
  • The product of the nos . is 12 .

And we need to find out the numbers. So let us take ,

  • First number be x
  • Second number be 1-x .

<u>According</u><u> to</u><u> </u><u>first </u><u>condition</u><u> </u><u>:</u><u>-</u><u> </u>

\rm\implies 1st \ number * 2nd \ number= -12\\\\\rm\implies x(1-x)=-12\\\\\rm\implies x - x^2=-12\\\\\rm\implies x^2-x-12=0\\\\\rm\implies x^2-4x+3x-12=0\\\\\rm\implies x(x-4)+3(x-4)=0\\\\\rm\implies (x-4)(x+3)=0\\\\\rm\implies\boxed{\red{\rm x = 4 , -3 }}

<u>Hence </u><u>the</u><u> </u><u>numbers</u><u> </u><u>are </u><u>4</u><u> </u><u>and </u><u>-</u><u>3</u><u> </u>

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3 years ago
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