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.
Fast and Basic. The fastest stroke for most swimmers is the front crawl. The crawl begins in a facedown position with arms and legs extended. The arms alternate pulling against the water along the front of the body, exiting the water just below hip level.utting It All Together. Freestyle events in swimming meets allow competitors to use any of the four competitive strokes -- crawl, breaststroke, butterfly or backstroke. It's not uncommon to see an athlete vary between strokes in long-distance events, but the crawl is almost always used in sprinting competitions.