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A sample counted for 10 minutes resulted in 1,000 counts. The background count was 250 counts over a 10 minute period. Assuming negligible radioactive decay of the sample during counting, the net counting rate in counts per minute and the standard deviation are approximately: a. 750±35 cpm b. 75±10 cpm c. 75±3.5 cpm d. 85+5.5 cpm e. 816 cpm

A sample counted for 10 minutes resulted in 1,000 counts. The background count was 250 counts over a 10 minute period. Assuming negligible radioactive decay of the sample during counting, the net counting rate in counts per minute and the standard deviation are approximately: a. 750±35 cpm b. 75±10 cpm c. 75±3.5 cpm d. 85+5.5 cpm e. 816 cpm

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A sample counted for 10 minutes resulted in 1,000 counts. The background count was 250 counts over a 10 minute period. Assuming negligible radioactive decay of the sample during counting, the net counting rate in counts per minute and the standard deviation are approximately: a. 750±35 cpm b. 75±10 cpm C. 75+3.5 cpm d. 85±5.5 cpm e. 8±6 cpm
Transcribed Image Text:A sample counted for 10 minutes resulted in 1,000 counts. The background count was 250 counts over a 10 minute period. Assuming negligible radioactive decay of the sample during counting, the net counting rate in counts per minute and the standard deviation are approximately: a. 750±35 cpm b. 75±10 cpm C. 75+3.5 cpm d. 85±5.5 cpm e. 8±6 cpm
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