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How often does more than one tornado happen at the same time?
Fairly often actually. It is not uncommon for multiple supercells to produce tornadoes at the same time during an outbreak. Even more often several tornadoes form and dissipate in succession, though in most cases no two are on the ground at the same time.
What kind of risk did you take during the time span of this evaluation?
management skills
What is the chance of a tornado hitting Killeen TX?
Chances are fairly high overall. Killeen has had several weak tornadoes in the past, and a number of strong tornadoes have hit fairly close to the town. The chances of it getting hit at any given time or in any given year, however, are low.
The most commonly used greek letters in statistics?
I'll give you some common Greek symbols used in statistical analyses. I can't tell you which is the most common one given the enormous task of reviewing every statistics book. The Greek mu for mean, sigma for variance and rho for correlation are probably the first ones that one encounters in statistical analyses. Also, beta for beta distribution, gamma for gamma distribution, chi for chi-squared distribution. Alpha and beta are common as distribution parameters. In derivations, delta is common for differences of variables. Tau is common for a time variable. You will find more information in the related link.
What is difference between most of the time and much of the time?
Most of the time is more than half of the time and less than all of the time. It's a majority of the time. Much of the time is just a large part of the time, not necessarily more than half.
