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A sample is counted for 30 minutes, and yields 1220 counts. the background count rate for...

A sample is counted for 30 minutes, and yields 1220 counts. the background count rate for the detector is 5 cpm. a) what are the standard deviation of the gross and background count rates for a 30 min count time?

b)what is the net count rate and its standard deviation?

c)Define a 95% confidence interval for the net count rate ?

Science   Advanced-Physics   
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consider the sample

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