= 12. Semi-Interquartile Range. The semi-interquartile range of a distribution is half the difference between the upper and lower quartiles, or half the interquartile range. Therefore, from the example above, it was determined that the interquartile range = 12.
Electronic Viewfinders (EVFs) An EVF is basically a very small screen inside a viewfinder, so you can put your eye up to the viewfinder and use it like a traditional camera. On most cameras with EVFs you can switch the view between the viewfinder and the rear LCD screen interchangeably.
Keep in mind that two different types of viewfinders exist. An optical viewfinder, which is typically found with a DSLR type of camera, uses a mirror and a prism to reflect the actual view of the scene that's traveling through the lens back up through the viewfinder.