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68 is a composite number; a square-prime, of the form (p 2, q) where q is a higher prime.It is the eighth of this form and the sixth of the form (2 2.q).. 68 is a Perrin number.
95% of the area under the normal distribution lies within 1.96 standard deviations away from the mean.. In probability and statistics, the 97.5th percentile point of the standard normal distribution is a number commonly used for statistical calculations.
Haplogroup E-V68, also known as E1b1b1a, is a major human Y-chromosome DNA haplogroup found in North Africa, the Horn of Africa, Western Asia and Europe.It is a subclade of the larger and older haplogroup, known as E1b1b or E-M215 (also roughly equivalent to E-M35).