10. If a dog that weighs 12 pounds is added to the sample for breed A, the new standard deviation is likely to be (greater than / less than / still equal to) 2.4 pounds.

Find the radius of the circle by finding the distance between the viewer and the beacon. 
then find the circumference by using 2πr2

this will be the distance the light covers over 1 revolution.
then using dimensional analysis:
3 rev/min (7.037 km/rev) (60 min/1 hr) = 1266.7 km/hr