Determine the half-life of radioactive element
The unknown radioactive element decays in non-radioactive substances. In 760 days radioactivity of the sample decreases by 62 percent.
i) Determine the half-life of element?
ii) How long it will take for the sample of 100mg to decay to 96 mg?
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Employ the given degree of confidence and sample data to construct a confidence interval for the population mean? Assume that the population has a normal distribution.
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A lot of 200 items is inspected by drawing the sample of size n without replacement. The lot is accepted only if all the items in sample are good. What is the required sample size to make sure that lots containing 2% unacceptable items would be re
The tank has 1740 L of pure water. The solution which has 0.07 kg of sugar per liter enters the tank at the rate 9 L/min. Determine amount of sugar in tank after t minutes.
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