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Martin; 58 year old male living in Basingstoke, UK. Religious? Well even if you are not does it hurt to cover all possibilities? Laid back, inquisitive, persistent. I have two goldfish - there is also a cat in the house (it's not mine) which I would like to give away! I've always been a...

Standard deviation is a measure of variance of a normal distribution (often referred to as a bell curve). If you add up all the values of a range of measures and divide by the number of values you obtain an arithmetic mean. Let's say that mean is 5.5 - the SD is calculated by a well know...