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.
A-1- Types of Nasogastric Tubes. Types of Nasogastric Tubes. Standard Nasogastric Tubes. The standard nasogastric tube amy be used for either suctioning gastric contents or administering tube feedings. A Levin tube comes in a variety of sizes from 5 French (very small) to 18 French (very large). All are approximately 50 inches long.