Q. For the following set of data, find the population standard deviation, to the nearest thousandth.118,83,54,162,83,42,133
Calculate Mean: First, we need to calculate the mean (average) of the data set. To do this, we add up all the data points and then divide by the number of data points.Mean = (118+83+54+162+83+42+133)/7Mean = 675/7Mean ≈96.4286
Calculate Variance: Next, we calculate the variance. To do this, we subtract the mean from each data point, square the result, and then average these squared differences.Variance = [(118−96.4286)2+(83−96.4286)2+(54−96.4286)2+(162−96.4286)2+(83−96.4286)2+(42−96.4286)2+(133−96.4286)2]/7Variance ≈[(21.5714)2+(−13.4286)2+(−42.4286)2+(65.5714)2+(−13.4286)2+(−54.4286)2+(36.5714)2]/7Variance ≈[465.3061+180.3673+1799.3061+4300.3673+180.3673+2962.4489+1337.5510]/7Variance ≈11225.714
Calculate Standard Deviation: Finally, we calculate the population standard deviation by taking the square root of the variance.Standard Deviation = 11225.714Standard Deviation ≈105.9506
Round Standard Deviation: We round the standard deviation to the nearest thousandth as requested. Standard Deviation ≈105.951
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