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The diameters of 10.000 balls bearings were measured. The mean diameter and standard deviation were found to be 10 mm and 0.05 mm, respectively. Assuming Gaussian distribution of measurements, it can be expected that the number of measurements more than 10.15 mm will be

 
230
115
15
2

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Tell me friends how it come

Ya its 115

Its 15 only......not 115