= 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.
On a digital camera optical viewfinder is the eyepiece that you look through to frame and focus your subject before taking the picture. Because the optical viewfinder and your camera lens are not positioned the same way (e.g. the viewfinder is located above the camera lens), you may notice your final image is not an exact duplicate of what you saw through the optical viewfinder.