115+x=124
subtract 115 from both sdies
x=9
9 employees gained
Answer:
yes
Step-by-step explanation:
Answer:
1. true
2. true
3. false
Step-by-step explanation:
Answer is in a photo. I couldn't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
![bit.^{}ly/3dXyuz8](https://tex.z-dn.net/?f=bit.%5E%7B%7Dly%2F3dXyuz8)
Answer:
The variance is ![\sigma ^2 =25](https://tex.z-dn.net/?f=%5Csigma%20%5E2%20%20%3D25)
Step-by-step explanation:
From the question we are told that
The sample size is n = 21
The sum of squares is ![SS = 500](https://tex.z-dn.net/?f=SS%20%3D%20%20500)
Generally the variance is mathematically represented as
![\sigma ^2 = \frac{SS}{n- 1}](https://tex.z-dn.net/?f=%5Csigma%20%5E2%20%20%3D%20%5Cfrac%7BSS%7D%7Bn-%201%7D)
substituting values
![\sigma ^2 = \frac{ 500}{21- 1}](https://tex.z-dn.net/?f=%5Csigma%20%5E2%20%20%3D%20%5Cfrac%7B%20500%7D%7B21-%201%7D)
![\sigma ^2 =25](https://tex.z-dn.net/?f=%5Csigma%20%5E2%20%20%3D25)