One ton of gravel covers 100 square feet at 2 inches thick, 80 square feet at 3 inches thick, 70 square feet at 4 inches thick or 60 square feet at 5 inches thick. These stones can be bought in sizes from 3/8 to 4 inches.
Some common types of gravel include rounded pea gravel for landscaping and concrete, crushed stone for road surfacing, coarse piedmont gravel carried by mountain waterways, semi-polished creek rock recovered from river beds, pay gravel with concentrations of precious metals and fine gravel with diameters of less than 4 millimeters. Weathering and erosion creates gravel deposits.
Learn MoreA poisson distribution displays discrete random variables, according to the University of Glasgow. Examples of discrete random variables include the numbers of cars that pass through an intersection in a given period of time. A discrete random variable is a representation of a countable number of separate values; this variable is always a finite number. Discrete random variables follow a poisson distribution.
Full Answer >Statistics are a methodology necessary in the field of statistics and are used to collect, analyze and evaluate data. Economics depends heavily on the use of statistics.
Full Answer >In statistics, common response refers to changes in both the explanatory and response variables that result from changes in another variable. The variable that triggers a common response is typically not part of the research design.
Full Answer >Although simple random samplings are a common research method, they are expensive to use, extremely time consuming and difficult to organize. A simple random sampling requires a complete list of all members of the target population so that the sample is a real representation of the larger group. Each individual in the population has the same chance of becoming part of the sample. All possible combinations of the sample are equally likely to occur, as well.
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