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.
In this first aid blog post we discuss the different types of drowning which can occur. So what are the different types of drowning? Drowning can be categorised into five different types: near drowning, dry drowning, freshwater drowning, salt water drowning and secondary drowning. Near drowning is when the patient is rescued before the point of death or there is temporary survival.