How much of a radioactive kind of niobium will be left after 4 minutes if the half-life is 1 minute and you start with 822,656 grams?

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The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25