Discussion
A normal curve in sediment size analysis is defined in term of the Mean and the ...........................
Answer: C
A normal curve is defined by the mean and the standard deviation.
The normal (Gaussian) distribution is fully described by two parameters: the mean, which fixes its centre, and the standard deviation, which fixes its spread. In grain size analysis the standard deviation of the phi values measures sorting.
In a normal curve the mode equals the mean, so it adds nothing; skewness is zero, since the curve is symmetric; and kurtosis has the fixed normal value. These describe departures from normality, not the normal curve itself.
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