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soldier1979 [14.2K]
3 years ago
6

How do I solve this?

Mathematics
1 answer:
Len [333]3 years ago
7 0
5 Girls + 3 Boys =8 (sample size)

Probability of choosing 1 boy P(1 B) = 3/8

Probability of NOT CHOOSING ANY BOY = 1-3/8 =5/8

Now apply the binomial probability to choose 3 Boys:

8C3(3/8)³(5/8)⁵ ==>P(All boys) = 0.28
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Find II 2e-3f II^2 assuming that e & f are unit vectors such that II e +f II=sqrt(3/2).
sergey [27]

<span>We are given that ||e|| = 1, ||f|| = 1. </span>

<span>Since ||e + f|| = sqrt(3/2), we have </span>
<span>3/2 = (e + f) dot (e + f) </span>
<span>= (e dot e) + 2(e dot f) + (f dot f) </span>
<span>= ||e||^2 + 2(e dot f) + ||f||^2 </span>
<span>= 1^2 + 2(e dot f) + 1^2 </span>
<span>= 2 + 2(e dot f). </span>

<span>So e dot f = -1/4. </span>

<span>Therefore, </span>
<span>||2e - 3f||^2 = (2e - 3f) dot (2e - 3f) </span>
<span>= 4(e dot e) - 12(e dot f) + 9(f dot f) </span>
<span>= 4||e||^2 - 12(e dot f) + 9||f||^2 </span>
<span>= 4(1)^2 - 12(-1/4) + 9(1)^2 </span>
<span>= 4 + 3 + 9 </span>
<span>= 16. </span>
6 0
3 years ago
Striking a tuning fork harder makes the sound coming from the fork louder. This changes the _________ of the sinusoidal graph.
Vera_Pavlovna [14]

Answer:

Amplitude.

Step-by-step explanation:

Loudness of a sound wave is proportional to its amplitude of vibration.

3 0
3 years ago
(solving for y) <br> 4x-5=7+4y
alexira [117]
y = x - 3

1. Subtract 7 from the right to the left.
* 4y = 4x - 12
2. Divide the 4 (constant) next to the 'y' to the other side.
* y = 4/4x - 12/4 
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3 0
3 years ago
I need help with this
m_a_m_a [10]
Nearest 100: 543,800
Nearest 1,000: 544,800
Nearest 10,000: 540,800

6 0
3 years ago
Read 2 more answers
What the area of this shape ​
Rudiy27

Answer:it is 6,930

Step-by-step explanation:

3 0
3 years ago
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