A distance AB is observed repeatedly using the same equipment and procedures, and the results, in meters, are listed below: 69.401, 69.400, 69.402, 69.396, 69.401, 69.401, 69.396, and 69.404.   1. Determine the range within which the observations should fall 90% of the time. Express your answers in meters to six significant figures separated by a comma. 2. What percentage of values fall within this range?   3. Determine the range within which the observations should fall 95% of the time. Express your answers in meters to six significant figures separated by a comma.   4. What percentage of values fall within this range?

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.