Ultrasound are usedful in diagnosing medical problems caused to human beings.
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Statistics are used in day to day life when calculating taxes. They are also used when making change, paying bills, and cooking.
Ultrasound is sound which has a frequency higher than that of audible sound.( like radar )ADDED: Not like radar. That uses radio waves, although sonar and radar principles are similar.
Almost every number that almost every ordinary person uses in his personal life on almost every typical day is a rational number.
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