An Alternative Definition for IQR. In some texts, the interquartile range is defined differently. It is defined as the difference between the largest and smallest values in the middle 50% of a set of data. To compute an interquartile range using this definition, first remove observations from the lower quartile.
A hard drive is a device used to store data in a semipermanent state on your computer. Computer memory is a series of small packets of data called bits. Each bit is a 1 or a 0, and each bit is stored as a small magnetic charge on the hard drive. A read/write head moves over the hard drive to retrieve or rewrite the bits as needed.
There are two main types of drives that your computer uses. The first is a hard drive which is used for storage, and the second is an optical drive used to read CDs and DVDs. A DVD-RW drive is an optical drive. On a desktop computer, the DVD-RW drive will normally be located on the front-upper portion of the case. On a laptop computer, the DVD-RW drive will normally be located along the side of the base. DVD-RW