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.
Next come the breaststroke and backstroke, then the sidestroke. Itâs good to do a few different strokes for a well-balanced workout. Even if swimming doesnât help you lose weight, it can help reduce body fat and waist circumference, while toning all major muscles (arms, shoulders, hips, legs). Swimming is also a good way for runners and cyclists to cross-train, since it uses different muscles.