Estimated Arrival and Price: Watch for the Aventador SV to be unveiled at the Geneva auto show in March before going on sale later in the year as a 2016 model. Prices are unknown, of course, but anything that Lamborghini calls âsuper fastâ is always super expensive. Donât be surprised if the SVâs price eclipses that of the $500,000 50th Anniversary Aventador by at least $100K. View Photos View Photos.
Other differences have to do with nomenclature, notation, and computations. For example, A a measurable characteristic of a population, such as a mean or standard deviation, is called a parameter; but a measurable characteristic of a sample is called a statistic. We will see in future lessons that the mean of a population is denoted by the symbol Î¼; but the mean of a sample is denoted by the symbol x.
Mean and Variance of Random Variables. The mean of a discrete random variable X is a weighted average of the possible values that the random variable can take. Unlike the sample mean of a group of observations, which gives each observation equal weight, the mean of a random variable weights each outcome xi according to its probability, pi.