Variance is the average of the squared deviations from the arithmetic mean. The standard deviation is a square root from variance value. The standard deviation is a measure of the variability of values around the mean and is meant to be used with values that are normally distributed (e.g., follow a normal curve).
This integrated the seat belts and airbag into a restraint system, rather than the airbag being considered an alternative to the seat belt. In 1987, the Porsche 944 turbo became the first car to have driver and passenger airbags as standard equipment. The Porsche 944 and 944S had this as an available option. The same year also saw the first airbag in a Japanese car, the Honda Legend.
1 Ford Expedition 1997 to 2002 Air Suspension: The 1997 to 2002 Ford Expedition air suspension consists of two Rear Air Spring Bags, and two rear Gas Shocks. 2  At the front of the vehicle are Gas Shocks on 4x2 models or Air Shocks on 4x4 models that are filled with air by an Air Suspension Compressor. More... 2  Ford Expedition 2003 to 2006 Air Suspension: The 2003 to 2006 Ford Expedition Air Spring Bag Strut Assembly is an Air Suspension System in which the Air Spring Bag and Strut works as a unit. 3  All four Air Spring Bag Strut Assemblies have Solenoids attached at the top mount to let the air in or out of the bags.