An electric meter reader took a sample of six electric meter readings in an apartment building which has a large number of electric meters. The readings, in hundreds of kilowatt- hours, are: 7.7, 8.0, 7.8, 8.3, 8.3, 8.1. The standard deviation (rounded off to four decimals) is: A. 0.2567 B. 0.2495 C. 0.0627 D. 0.2503

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