MathematicsHardHigh School (11–12)Statistics and Probability › StatisticsAPA-LevelIBAEEE (Amrita)AMUEEEAP EAPCET
Created by StemPy LabA technician measures the voltage of a battery five times and gets and volts. She treats the readings as a random sample of all possible readings and wants an estimate of the variance of the voltage. What is the sample variance?
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← A park ranger groups the lengths of 40 fallen branches, in classes of width 10 centimetres: 0 to 10 with frequency 3, 10 to 20 with 9, 20 to 30 with 14, 30 to 40 with 10 and 40 to 50 with 4. What is the median length, to two decimal places?A statistician wants to compare how steady two data sets are when their means are very different and their units differ. Which expression gives the coefficient of variation of a data set with mean x and standard deviation σ? →
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