Answer:
x>30.meaning that the x is greater than 30
The answer is 6 feet 10 inches
B= Exactly one solution
-6y+9y= 3y
3y+13=8y-3
3y=8y-16
-5y=-16
Answer:
a. 4.33.
Step-by-step explanation:
If there is only one correct answer out of four alternatives, the expected proportion of correct answers is p =0.25
Sample size (n) = 100 questions
The standard deviation of a proportion 'p' is given by:
![s=\sqrt{\frac{p*(1-p)}{n} }](https://tex.z-dn.net/?f=s%3D%5Csqrt%7B%5Cfrac%7Bp%2A%281-p%29%7D%7Bn%7D%20%7D)
Applying the given data:
![s=\sqrt{\frac{0.25*(1-0.25)}{100}}\\s=0.0433](https://tex.z-dn.net/?f=s%3D%5Csqrt%7B%5Cfrac%7B0.25%2A%281-0.25%29%7D%7B100%7D%7D%5C%5Cs%3D0.0433)
If X is the number of correct responses in 100 guesses, the standard deviation of X is:
![\sigma = n*s=100*0.0433\\\sigma = 4.33](https://tex.z-dn.net/?f=%5Csigma%20%3D%20n%2As%3D100%2A0.0433%5C%5C%5Csigma%20%3D%204.33)
The standard deviation of X is 4.33 questions.
Answer:
c
Step-by-step explanation: