What does Rule number 5 mean?

techtarget.com - What is rule of five (statistics)? | Definition from TechTarget

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The rule of five is a rule of thumb in statistics that estimates the median of a population by choosing a random sample of five from that population. It states that there is a 93.75% chance that the median value of a population is between the smallest and largest values in any random sample of five. This rule can be used to save data collection time in order to make a quicker business decision. In a scenario where the mid-point or median of a population is required, the rule of five can be used to approximate it. In any population, half the individuals will be above the median and half below. Therefore, the likelihood of choosing a value above or below the median is 50% either way, equivalent to the flip of a coin. The likelihood of flipping 100% tails or heads would be 1/32 or 3.125%. So the chance of not getting all heads or tails is 100 - (3.125 x 2), or 93.75. Thus, the probability of the median sample being between the lowest and highest samples in any random sampling of five is 93.25%. The goal of the rule of five is to reduce uncertainty without wasting resources gathering every piece of data. Rather than survey an entire population, applying the rule of five involves selecting five random members as a representative sample of the population. The results themselves may be less accurate, but finding the overall precision of an entire group is usually unnecessary. The rule of five makes it possible to achieve an acceptable level of accuracy to enable faster a decision-making process and trend prediction. The rule of five was conceived by Douglas Hubbard, the author of "How to Measure Anything: Finding the Value of Intangibles in Business" and an established expert in risk management, metrics and decision analysis.

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How long does SERE take?

This school lasts 19 days, during which time you'll be evaluated on your physical fitness, speaking ability, dedication, ability to complete tasks and follow instructions, and your leadership potential. Only the best will go on to the formal course – SERE Specialist Training (SST) at Fairchild AFB, Washington.

gosere.af.mil - About Us - Go SERE

Before you attend Basic Military Training (BMT) at Lackland Air Force Base, Texas, you’ll work with your recruiter to ensure you meet the requirements for SERE. In addition, the recruiter will administer your first PAST. Once you graduate from BMT, you’ll attend the SERE Specialist Screening course, also at Lackland. This school lasts 19 days, during which time you’ll be evaluated on your physical fitness, speaking ability, dedication, ability to complete tasks and follow instructions, and your leadership potential. Only the best will go on to the formal course – SERE Specialist Training (SST) at Fairchild AFB, Washington. SST is not for the weak. This 5 ½ months of intensive training requires a level of dedication most people simply do not have. You’ll learn to be a survivalist, and at the same time, learn to be an instructor. You’ll learn to survive and thrive in multiple environments – the mountains, desert, tropics and open ocean. Approximately three months of this training will be in the field. Training and instruction occurs in all major climatic conditions, often in remote locations and in all possible weather conditions. You’ll also become an expert in wilderness first aid, rough land evacuation and hand-to-hand combat. After completing SST, you’ll attend Army Airborne, the military parachute course. Once you upgrade to the next skill level, you could attend Military Free Fall, scuba and emergency medical technician courses, as well as other Air Force SERE schools. You also earn approximately 47 semester hours toward an associate’s degree through the Community College of the Air Force.