The mean score is 60 out of 100 and the standard deviation (in other words, the variation in the scores) is 15 marks (see our statistical guides, Measures of Central Tendency and Standard Deviation, for more information about the mean and standard deviation).
What Are the Six Different Types of Swimming Strokes? Swimming provides all-around, low-impact body conditioning as well as exciting competition. Competitive swim meets allow only four strokes -- butterfly, backstroke, breaststroke and the crawl. Two other strokes -- elementary backstroke and sidestroke -- contribute to swimming longer distances, as different sets of muscles are used. The fastest stroke for most swimmers is the front crawl.
Freestyle Swimming. Freestyle swimming also commonly referred to as the Front Crawl stroke is the fastest swimming style developed. Of all four swimming strokes, two are considered long axis strokes, Freestyle swimming and the other being Backstroke. Freestyle is the only stroke which is not regulated by FINA, though it is the most popular stroke swum at most competitions and generally the stroke which most people use for training.