= 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.
In this post I explain the optics of an SLR and compare it to viewfinders from mirrorless cameras. A single-lens reflex camera uses a mirror (hence the term reflex) and a pentaprism that allows the photographer to look through the lens and see exactly what will be captured in the photograph. A digital single lens reflex camera is a camera that combines the optics of an SLR with a digital imaging sensor.