Answer: numbers
Step-by-step explanation:

Pooled Combined Variance 
Test Statistic:



Degrees of freedom = 


The table value is greater than the calculated value.
Thus we accept H0.
Answer:
![52 \sqrt[5]{7}](https://tex.z-dn.net/?f=52%20%5Csqrt%5B5%5D%7B7%7D%20)
Step-by-step explanation:

![= 52 \sqrt[5]{7}](https://tex.z-dn.net/?f=%20%3D%2052%20%5Csqrt%5B5%5D%7B7%7D%20)
The fourth one should be the correct answer