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Just a note

  • For relative frequencies, if variable f is the relative frequency and the total relative frequency is 1, you can estimate the mean using sum(f * m)

  • The estimate we obtain from these data differs somewhat from the mean of the original set of 30 values - it would be closer if the original set was larger.

    This formula uses the midpoints as the best estimate of each class interval's location - which, aside from the problem of sample size, depends upon how those class intervals were originally decided upon.