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For large number of measurements the mean is calculated by taking a sample. Each sample that is taken has a mean. The mean of various sample difference from sample and are known to flow a definite distribution known as distribution of means,
If the parent measurements from which a sample is drawn is distributed normally with mean µ and standard deviation σ, then the mean of sample also distributed normally with meanµ and the standard deviation = standard deviation of mean
Hydraulic analogy
Metering and Billing System Previously, you have learnt about various measures for reducing commercial losses of a utility. You have studied in which the metering and billing
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