= 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.
LCD (liquid crystal display) is a display technology. LED (light emitting diode) is an illumination technology. There is a break down here in understanding of terminology (You said it perfectly however). LED is a light emitting diode - ie: a type of light bulb. And LCD is a liquid crystal display. It does not emit light by itself. It is always backlit from an independent light source.