Answer:
30.42 (if rounded to the tenths place)
Step-by-step explanation:
Because the y value is the time it takes to complete 1 lap.

Pooled Combined Variance 
Test Statistic:



Degrees of freedom = 


The table value is greater than the calculated value.
Thus we accept H0.
Answer:
666
Step-by-step explanation:
666
666
666
666
666
666
666
666
66
6
6
6
56
6
6
6