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    A measurement of background radiation recorded 142 counts in a 20 minute interval. Find the mean background and its uncertainty in a 1 minute interval.

    I've calculated that the mean background is 142/20 = 7.1, but what would be the uncertainty?

    Any help would be appreciated. Thanks.
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    (Original post by ryanwilk)
    A measurement of background radiation recorded 142 counts in a 20 minute interval. Find the mean background and its uncertainty in a 1 minute interval.

    I've calculated that the mean background is 142/20 = 7.1, but what would be the uncertainty?

    Any help would be appreciated. Thanks.
    do they not tell you 'measured to the nearest...' or something similar? im a little unsure how to tackle this also...
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    I may be approaching this from the wrong angle but did the question give any more info? Eg if we knew the standard deviation it would be possible to work out a confidence interval or something...
 
 
 
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