At the core of biology and other sciences lies a problem-solving approach called the scientific method. 1  Make an observation. 2  Ask a question. 3  Form a hypothesis, or testable explanation. 4  Make a prediction based on the hypothesis.  Test the prediction.
Xi. Xi is the 14th letter of the Greek alphabet. It is pronounced in Modern Greek, and generally or in English. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh. Xi is not to be confused with the letter chi, which gave its form to the Latin letter X.
---------------- Case2: The symbol Î¼ (Greek: mu) is used to denote the arithmetic mean of an entire population. Or, for a random number that has a defined mean, Î¼ is the probabilistic mean or expected value of the random number.t serves as a symbol for the SI prefix micro; it is the only non-Latin character used for an SI prefix. Micro sign is derived from the small Greek letter mu (Î¼), The two may or may not look the same, depending on the font. The HTML representation for it is Âµ (whereas mu is represented as Î¼).