Final answer:
Statistical measures such as the range, mean, variance, and standard deviation require a list of numerical values, which are currently missing from the student's question. These measures describe the distribution of densities of elements in Earth's crust.
Step-by-step explanation:
The question asks for the calculation of the range, mean, variance, and standard deviation of the densities of the most abundant elements in Earth's crust. However, to perform any statistical analysis, we must first have a list of values to work with. Unfortunately, the student has provided only the text and not the actual density values that these calculations require.
Once the actual density values are provided, the range can be found by subtracting the smallest value from the largest value. The mean is the average of the values, computed by summing all the densities and dividing by the number of elements. Variance is the average of the squared differences from the Mean, and standard deviation is the square root of the variance. These calculations help in understanding the distribution of element densities in the Earth's crust.