![\frac{\textbf{1}}{\textbf{20}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctextbf%7B1%7D%7D%7B%5Ctextbf%7B20%7D%7D)
Step-by-step explanation:
Probability=![\frac{\text{number of favourable outcomes}}{\text{total number of outcomes}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7Bnumber%20of%20favourable%20outcomes%7D%7D%7B%5Ctext%7Btotal%20number%20of%20outcomes%7D%7D)
Probability for a randomly chosen girl to be senior=![\frac{\text{number of senior girls}}{\text{total number of girls}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7Bnumber%20of%20senior%20girls%7D%7D%7B%5Ctext%7Btotal%20number%20of%20girls%7D%7D)
Probability for a randomly chosen girl to be senior=![\frac{7}{8+11+9+7}=\frac{7}{35}=\frac{1}{5}](https://tex.z-dn.net/?f=%5Cfrac%7B7%7D%7B8%2B11%2B9%2B7%7D%3D%5Cfrac%7B7%7D%7B35%7D%3D%5Cfrac%7B1%7D%7B5%7D)
Probability for a randomly chosen boy to be senior=![\frac{\text{number of senior boys}}{\text{total number of boys}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7Bnumber%20of%20senior%20boys%7D%7D%7B%5Ctext%7Btotal%20number%20of%20boys%7D%7D)
Probability for a randomly chosen girl to be senior=![\frac{9}{10+7+10+9}=\frac{9}{36}=\frac{1}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B9%7D%7B10%2B7%2B10%2B9%7D%3D%5Cfrac%7B9%7D%7B36%7D%3D%5Cfrac%7B1%7D%7B4%7D)
For two independent events,
Probability for both event 1 and event 2 to take place=![\text{probability of event 1} \times \text{probability of event 2}](https://tex.z-dn.net/?f=%5Ctext%7Bprobability%20of%20event%201%7D%20%5Ctimes%20%5Ctext%7Bprobability%20of%20event%202%7D)
Since choosing boys and girls is independent,
Probability for both boy an girl chosen to be senior=![\text{probability for boy to be senior}\times\text{probability for girl to be senior}](https://tex.z-dn.net/?f=%5Ctext%7Bprobability%20for%20boy%20to%20be%20senior%7D%5Ctimes%5Ctext%7Bprobability%20for%20girl%20to%20be%20senior%7D)
Probability for both boy and girl chosen to be senior=![\frac{1}{5} \times \frac{1}{4} = \frac{1}{20}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B5%7D%20%5Ctimes%20%5Cfrac%7B1%7D%7B4%7D%20%3D%20%5Cfrac%7B1%7D%7B20%7D)
So,required probability is ![\frac{1}{20}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B20%7D)
Answer:
x=6
Step-by-step explanation:
Ⓗⓘ ⓣⓗⓔⓡⓔ
3(x-1)=15+x
3x-3=15+x
2x-3=15
2x=12
x=6
(っ◔◡◔)っ ♥ Hope this helped! Have a great day! :) ♥
Answer: 48 minutes
Step-by-step explanation:
Han spent 75 minutes practicing the piano.
Tyler spent only 64% as much as that. How long did Tyler practice:
= 75 * 64%
= 48 minutes
Answer:
The correct answer would be C- (UV)2 + (VW)2 = (UW)2, because 81 + 144 = 225
-Thank you
Answer:
6!!!!!!!!!!!!!!!!!!!!!!!
Step-by-step explanation: