Equation:
Time*speed= distance
1.7(time)*22.4(speed)=38.08meter(distance)
The length to the nearest foot would be 60 ft.
95% of a normal distribution lies within ±1.96 standard deviations of the mean. That is, ±3 years represents ±1.96 standard deviations, so ...
.. the standard deviation is 3/1.96 = 1.53 years.
