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.
The most common swimming strokes or styles are the freestyle stroke, the breaststroke, the backstroke and the butterfly stroke. They are well-known because they are used in swimming competitions.The swim strokes used in competitions. Besides these common strokes, other styles of swim strokes exist like the sidestroke, the trudgen, the combat swimmer stroke etc.They are used less often but can also be fun to learn.he swim strokes used in competitions. Besides these common strokes, other styles of swim strokes exist like the sidestroke, the trudgen, the combat swimmer stroke etc. They are used less often but can also be fun to learn.