Consider the following data: 4.4, 5.3, 4.4, 2.8, 0.9, 6.1, 3.0, 8.6, 10.7, 4.3, 1.9, 12.0, 5.9, 4.8, 7.7 The sample variance is equal to (the answer may be rounded up to 3 decimal places of the actual value):

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?