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UkoKoshka [18]
3 years ago
12

Percents! Please answer!!

Mathematics
1 answer:
Fofino [41]3 years ago
7 0

Answer:

39%

Step-by-step explanation:

83-last price

83 last price

100 x ?

100 * last price = 83 . x

x= 39

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There are 15 identical pens in your drawer, nine of which have never been used. On Monday, yourandomly choose 3 pens to take wit
DaniilM [7]

Answer: p = 0.9337

Step-by-step explanation: from the question, we have that

total number of pen (n)= 15

number of pen that has never been used=9

number of pen that has been used = 15 - 9 =6

number of pen choosing on monday = 3

total number of pen choosing on tuesday=3

note that the total number of pen is constant (15) since he returned the pen back .

probability of picking a pen that has never been used on tuesday = 9/15 = 3/5

probability of not picking a pen that has never been used on tuesday = 1-3/5=2/5

probability of picking a pen that has been used on tuesday = 6/15 = 2/5

probability of not picking a pen that has not been used on tuesday= 1- 2/5= 3/5

on tuesday, 3 balls were chosen at random and we need to calculate the probability that none of them has never been used .

we know that

probability of ball that none of the 3 pen has never being used on tuesday = 1 - probability that 3 of the pens has been used on tuesday.

to calculate the probability that 3 of the pen has been used on tuesday, we use the binomial probability distribution

p(x=r) = nCr * p^{r} * q^{n-r}

n= total number of pens=15

r = number of pen chosen on tuesday = 3

p = probability of picking a pen that has never been used on tuesday = 9/15 = 3/5

q = probability of not picking a pen that has never been used on tuesday = 1-3/5=2/5

by slotting in the parameters, we have that

p(x=3) = 15C3 * (\frac{2}{5})^{3} * (\frac{3}{5})^{12}

p(x=3) = 455 * 0.4^{3} * 0.6^{12}

p(x=3) = 455 * 0.064 * 0.002176

p(x=3) = 0.0633

thus probability that 3 of the pens has been used on tuesday. = 0.0633

probability of ball that none of the 3 pen has never being used on tuesday  = 1 - 0.0633 = 0.9337

3 0
3 years ago
Determine the volume of a cube with a side length of 7.5m​
satela [25.4K]

Answer:

V≈421.88

Step-by-step explanation:

5 0
3 years ago
Find the slope of the line.
lukranit [14]

Answer:

0

Step-by-step explanation:

slope = dy/dx

= 0/x

= 0

7 0
2 years ago
A plane travels at a speed of 180 mph in still air. Flying with a tailwind, the plane is clocked over a distance of 900 miles. F
valina [46]
The answer the answer is appropriately 40
8 0
2 years ago
Hi everyone, I need a LOT of help. If you can, can you please tell me the answers to all three of them. Thank you Soooo much! An
ohaa [14]

The solution to the combination questions are

  • The number of different pasta dinner is 30
  • The number of ways to dress the mannequin is 84
  • The number of different combination is 240

<h3>The number of pasta dinner</h3>

The given parameters are:

  • Noodles = 6
  • Appetizer = 5

The number of different pasta dinner is calculated as:

Pasta = Noodles * Appetizer

So, we have:

Pasta = 6 * 5 = 30

Hence, the number of different pasta dinner is 30

<h3>The number of ways to dress the mannequin</h3>

The given parameters are:

  • T-shirts = 7
  • Jean style = 6
  • Jacket = 2

The number of ways to dress the mannequin is calculated as:

Ways = T-shirts * Jean style* Jacket

So, we have:

Ways = 7 * 6 * 2 = 84

Hence, the number of ways to dress the mannequin is 84

<h3>The number of different combination</h3>

The given parameters are:

  • Skates = 4
  • Color = 3
  • Decoration = 5
  • Shoe lace = 4

The number of different combination is calculated as:

Ways = Skates * Color * Decoration * Shoe lace

So, we have:

Ways = 4 * 3 * 5  * 4 =240

Hence, the number of different combination is 240

Read more about combination at:

brainly.com/question/11732255

#SPJ1

7 0
2 years ago
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