9514 1404 393
Answer:
C {2, 4, 9, 16}
Step-by-step explanation:
The domain is the list of numbers at the tails of the arrows.
The range is the list of numbers at the heads of the arrows: {2, 4, 9, 16}.
Answer:
x < -7
Step-by-step explanation:
3x < -21
<u>Step 1: Divide both sides by 3</u>
3x < -21
3x / 3 < -21 / 3
x < -7
Answer: x < -7
Answer:
The answer is below
Step-by-step explanation:
The z score is a score used to determine the number of standard deviations by which the raw score is above or below the mean, it is given by the equation:
![z=\frac{x-\mu}{\sigma} \\\\\mu=mean, \sigma=standard\ deviation,x=raw\ score\\\\for\ a\ sample\ n:\\\\z=\frac{x-\mu}{\sigma/\sqrt{n} }](https://tex.z-dn.net/?f=z%3D%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%7D%20%5C%5C%5C%5C%5Cmu%3Dmean%2C%20%5Csigma%3Dstandard%5C%20deviation%2Cx%3Draw%5C%20score%5C%5C%5C%5Cfor%5C%20a%5C%20sample%5C%20n%3A%5C%5C%5C%5Cz%3D%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%2F%5Csqrt%7Bn%7D%20%7D)
Given that μ = 650, σ = 50. To find the probability that 5 students who have a mean of 490, we use:
![z=\frac{x-\mu}{\sigma/\sqrt{n} } =\frac{490-650}{50/\sqrt{5} } =-7.16](https://tex.z-dn.net/?f=z%3D%5Cfrac%7Bx-%5Cmu%7D%7B%5Csigma%2F%5Csqrt%7Bn%7D%20%7D%20%3D%5Cfrac%7B490-650%7D%7B50%2F%5Csqrt%7B5%7D%20%7D%20%3D-7.16)
From the normal distribution table, P(x < 490) = P(Z < -7.16) = 0.0001 = 0.01%
Since only a small percentage of people score about 490, hence the local newspaper editor should write a scathing editorial about favoritism