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Leni [432]
3 years ago
9

A professor has 7 books they are trying to arrange on a shelf. If the professor selects 3 books at a time, how many different ar

rangements of books can they come up with?
i got 210 but im not sure
Mathematics
1 answer:
nlexa [21]3 years ago
7 0

<em>The number of </em><em>different arrangements </em><em>of books is 210</em>

What is the formula for Permutation?

Permutation in mathematics can be calculated by using the formula

nPr = \frac{n!}{(n - r)!}

where

  • nPr = Permutation required
  • n = total number of objects = 7
  • r = number of objects selected = 3

nPr = \frac{7!}{(7-3)!}

nPr = \frac{5040}{24}

nPr = 210

Therefore, the required number of ways is 210

learn more about permutations here brainly.com/question/112112

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Thickness measurements of ancient prehistoric Native American pot shards discovered in a Hopi village are approximately normally
saveliy_v [14]

Answer:

0.8029 = 80.29% probability that the thickness is between 3.0 and 7.0 mm.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean of 4.6 millimeters (mm) and a standard deviation of 1.5 mm.

This means that \mu = 4.6, \sigma = 1.5

Find the probability that the thickness is between 3.0 and 7.0 mm.

This is the pvalue of Z when X = 7 subtracted by the pvalue of Z when X = 3. So

X = 7

Z = \frac{X - \mu}{\sigma}

Z = \frac{7 - 4.6}{1.5}

Z = 1.6

Z = 1.6 has a pvalue of 0.9452

X = 3

Z = \frac{X - \mu}{\sigma}

Z = \frac{3 - 4.6}{1.5}

Z = -1.07

Z = -1.07 has a pvalue of 0.1423

0.9452 - 0.1423 = 0.8029

0.8029 = 80.29% probability that the thickness is between 3.0 and 7.0 mm.

6 0
3 years ago
6. Solve the triangle by finding the length of DF and the measures of all the angles. For side lengths, round to the
poizon [28]

Answer:

∠F = 59°

∠E = 31°

DF = ≅ 3  (2.98)

Step-by-step explanation:

4 0
3 years ago
A pair of fair dice is cast. What is the probability that the sum of the numbers falling uppermost is less than 4, if it is know
mestny [16]
<span>The ways to make a 7 with 2 die is:
(1) 6 and 1
(2) 1 and 6
(3) 2 and 5
(4) 5 and 2
(5) 3 and 4
(6) 4 and 3
There are 6 ways to make a 7 with the 2 die,
but there is only 1 way to make 7 if the 1st
die comes up 6.
The probability of getting
(1) 6 and 1 is 1/6</span>
8 0
4 years ago
1+4=5<br> 2+5=7<br> 3+6=21<br> 8+11=
Karolina [17]
This is a common math problem. There are two ways to answer this question but both will give you the same answer. There is a misconception that this can also equal 40. If someone posts that the answer is 40, please let me know and I will explain why that is not actually the answer.

1+4=5 2+5=7
3+6=21
8+11=

These equations are actually:

1*(4+1)=52*(5+1)=7
3*(6+1)=21
8*(11+1)=96

Therefore:
8+11 = 96
3 0
3 years ago
Read 2 more answers
-4(11x+2)=80<br> Solve for x
jek_recluse [69]

Answer: x=-2

Step-by-step explanation:

To solve for x, we want to isolate x.

-4(11x+2)=80         [distribute]

-44x-8=80             [add both sides by 8]

-44x=88                 [divide both sides by -44]

x=-2

Now, we know that x=-2.

3 0
3 years ago
Read 2 more answers
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