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Nonamiya [84]
3 years ago
8

The table shows the wavelength of the sound produced by keys on a piano x keys away from the A above middle C.

Mathematics
2 answers:
Virty [35]3 years ago
5 0
B) 49.44 is the right answer
ZanzabumX [31]3 years ago
3 0

"b" on e2020 is correct

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What are the solutions to the equation 9x2 = 49, rounded to the nearest tenth?
Maksim231197 [3]
9x 2=49
9x=24.5
x=2.72222
5 0
3 years ago
A well-mixed cookie dough will produce cookies with a mean of 6 chocolate chips apiece. What is the probability of getting a coo
posledela

The probability of getting a cookie with no more than 3 chips is 0.714.

<h3>What is probability?</h3>

It is defined as the ratio of the number of favorable outcomes to the total number of outcomes, in other words, the probability is the number that shows the happening of the event.

We have:

Well-mixed cookie dough will produce cookies with a mean of 6 chocolate chips apiece.

Using poison ratio:

\rm P (X = k) = \dfrac{\lambda^k e^{-\lambda}}{k!}

λ is the mean number of chocolate chips in a piece

\rm P (X = 6) = \dfrac{6^k e^{-6}}{k!}

P(X ≥ 5) = 1 - P(X < 5)

P(X ≥ 5) = 1 - P(X = 0) + P(X = 1)  + P(X = 2)  + P(X = 3) + P(X = 4)  

\rm P(X \geq  5)  =  1-[\dfrac{6^0 e^{-6}}{0!}+\dfrac{6^1 e^{-6}}{1!}+\dfrac{6^2 e^{-6}}{2!}+\dfrac{6^3 e^{-6}}{3!}+\dfrac{6^4 e^{-6}}{4!}]

After solving;

P(X ≥ 5) = 0.714

Thus, the probability of getting a cookie with no more than 3 chips is 0.714.

Learn more about the probability here:

brainly.com/question/11234923

#SPJ1

6 0
2 years ago
Need to know the population in 2015
Margarita [4]
\bf P=1110.9e^{kt}\quad &#10;\begin{cases}&#10;P=1200 &\textit{in thousands}\\&#10;t=2 &\textit{in 2002}&#10;\end{cases}\implies 1200=1110.9e^{k2}&#10;\\\\\\&#10;\cfrac{1200}{1110.9}=e^{2k}\implies ln\left( \frac{1200}{1110.9} \right)=ln(e^{2k})\implies ln\left( \frac{1200}{1110.9} \right)=2k&#10;\\\\\\&#10;\cfrac{ln\left( \frac{1200}{1110.9} \right)}{2}=k\implies 0.0385755\approx k\implies 0.0386\approx k\\\\&#10;-------------------------------\\\\

\bf P=1110.9e^{0.0386t}\qquad &#10;\begin{cases}&#10;t=14\\&#10;\textit{year 2015}&#10;\end{cases}\implies P=1110.9e^{0.0386\cdot 14}&#10;\\\\\\&#10;P\approx 1907.0747\implies about\ 1,907,075\textit{ once rounded up}
3 0
2 years ago
Harlee uses a device to convert her electronic textbook into braille. Unfortunately, the textbook did not include text descripti
Ainat [17]

Answer:

Mean: 1.5

Standard Deviation: 0.9

Step-by-step explanation:

2/3 of the pages have diagrams, and N is the number of pages Harlee reads to reach a page with a diagram. In order to find the mean, divide 1/(2/3) to get 1.5 as your mean, and then divide sqrt(1-(2/3))/2/3 to get .8660, which rounds to .9.

7 0
2 years ago
How to do this question plz answer my question step by step plzz plz plz plz ​
never [62]

Answer:

40°, 95°, 105°, and 160°

Step-by-step explanation:

Let the smallest angle be x.

Measures of the 3 angles can be expressed as:

x + 55

x + 65

x + 120

The sum of all angles in a quadrilateral = 360°.

Therefore, (x + 55) + (x + 65) + (x + 120) = 360

Solve for x

x + 55 + x + 65 + x + 120 = 360

3x + 240 = 360

3x + 240 - 240 = 360 - 240

3x = 120

\frac{3x}{3} = \frac{120}{3}

x = 40

The smallest angle = 40°

Plug in the value of x in the earlier stated expressions to find the measure of the other angles:

x + 55 = 40 + 55 = 95

x + 65 = 40 + 65 = 105

x + 120 = 40 + 120 = 160

3 0
2 years ago
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