Answer:21 1/8 is the answer
Step-by-step explanation:
Answer:
Step-by-step explanation:
if you need help let me know
3y - y + 8 - 2 = 20
3y - y = 2y
8 - 2 = 6
2y + 6 = 20
2y = 20 - 6
y = 10 - 3
the answer is: y = 7
Answer:
![\mu -2\sigma = 24-2*3= 18](https://tex.z-dn.net/?f=%20%5Cmu%20-2%5Csigma%20%3D%2024-2%2A3%3D%2018)
![\mu -2\sigma = 24+2*3= 30](https://tex.z-dn.net/?f=%20%5Cmu%20-2%5Csigma%20%3D%2024%2B2%2A3%3D%2030)
So then we can conclude that we expect the middle 95% of the values within 18 and 30 minutes for this case
Step-by-step explanation:
For this case we can define the random variable X as the amount of time it takes her to arrive to work and we know that the distribution for X is given by:
![X \sim N(\mu = 24, \sigma =3)](https://tex.z-dn.net/?f=%20X%20%5Csim%20N%28%5Cmu%20%3D%2024%2C%20%5Csigma%20%3D3%29)
And we want to use the empirical rule to estimate the middle 95% of her commute times. And the empirical rule states that we have 68% of the values within one deviation from the mean, 95% of the values within two deviations from the mean and 99.7 % of the values within 3 deviations from the mean. And we can find the limits on this way:
![\mu -2\sigma = 24-2*3= 18](https://tex.z-dn.net/?f=%20%5Cmu%20-2%5Csigma%20%3D%2024-2%2A3%3D%2018)
![\mu -2\sigma = 24+2*3= 30](https://tex.z-dn.net/?f=%20%5Cmu%20-2%5Csigma%20%3D%2024%2B2%2A3%3D%2030)
So then we can conclude that we expect the middle 95% of the values within 18 and 30 minutes for this case
The answer to you question is B