Answer:
12.8
Step-by-step explanation:
12.8x25=320
320 divide 25=12.8
Answer: 0.0336
Step-by-step explanation:
Given : The distribution of cholesterol levels in teenage boys is approximately normal with mean :![\mu= 170](https://tex.z-dn.net/?f=%5Cmu%3D%20170)
Standard deviation : ![\sigma= 30](https://tex.z-dn.net/?f=%5Csigma%3D%2030)
The formula for z-score is given by :-
![z=\dfrac{x-\mu}{\sigma}](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7Bx-%5Cmu%7D%7B%5Csigma%7D)
For x=225
![z=\dfrac{225-170}{30}=1.83](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7B225-170%7D%7B30%7D%3D1.83)
The p-value =![P(z>1.83)=1-P(z](https://tex.z-dn.net/?f=P%28z%3E1.83%29%3D1-P%28z%3C1.83%29)
![=1-0.966375=0.033625\approx0.0336](https://tex.z-dn.net/?f=%3D1-0.966375%3D0.033625%5Capprox0.0336)
The probability that a teenage boy has a cholesterol level greater than 225 =0.0336
Answer:
B 2.28
Step-by-step explanation:
please mark brainliest answer so i can rank up
(56/7)+(168/7)=8+24=32. Your answer is: 32
Answer:
<h3>y = -32</h3>
Step-by-step explanation:
![y=-2x+8\\\\x=20](https://tex.z-dn.net/?f=y%3D-2x%2B8%5C%5C%5C%5Cx%3D20)
Substitute ; x =20 in given equation
![y =-2(20 )+8\\\\y = -40+8\\\\y = -32](https://tex.z-dn.net/?f=y%20%3D-2%2820%20%29%2B8%5C%5C%5C%5Cy%20%3D%20-40%2B8%5C%5C%5C%5Cy%20%3D%20-32)