Author: Anonymous

An article in The Journal of Data Science [“A Statistical Analysis of Well Failures in Baltimore County” (2009, Vol. 7, pp. 111-127)] provided the following table of well failures for different geological formation groups in Baltimore County.  Geological Formation Group Wells Failed Wells Not Failed Wells Total Gneiss  170 1,515 1,685 Granite 2 26 28 Loch Raven Schist  443 3,290 3,733 Mafic 14 349 363 Marble 29 280 309 Prettyboy Schist  60 1,343 1,403 Other Schists 46 887 933 Serpentine 3 36 39 TOTAL 767 7,726 8,493 Let A denote the event that the geological formation has more than 1000 wells, and let B denote the event that a well failed. Determine the number of wells in each of the following events. Find the following, P( Bc\A). The probability that the well did not fail given that the geological formation has more than 1000 wells.  

The average number of demand Company A receives in a month is 5000 with a standard deviation of 900 Y∼N(μ=5000, σ=900). This supply is normally distributed. What is the probability that the demand will be between 3800 and 5200 in any month. Find P(3800

A discrete random variable Y takes values 0,1,3,6,10 with probabilities: y 0 1 3 6 10 P(Y=y) 0.15 0.25 0.20 p 0.18 What is the value of p for this to be a probability mass function? Then calculate the expected value of Y, E(Y). TI-84 online calculator

In a city, 35% of adults are smokers. Of the smokers, 25% exercise regularly; of the non-smokers, 50% exercise regularly. If a randomly selected adult is known to exercise regularly, what is the probability that the person is a smoker, given that they regularly exercise P(smoker∣exercises)? TI-84 online calculator

A company has 20 employees. Six (6) are managers, ten (10) are engineers, and four (4) are Technical specialists. In how many ways can the company select a CEO, a CFO, and a COO, given that only a manager can be the CEO, and the other two positions can be filled by any employee, with no one holding more than one position. TI-84 online calculator

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14. Using only the periodic table, arrange each set of particles by size, largest to smallest:O, P, Sa.    The size order is P > S > Ob.     The size order is P< S > Oc.    The size order is P> S< Od.    The size order is P > S > O

12. TNT has the chemical formula C7H5N3O6. How many grams of nitrogen are present in 25 g TNT? 1 mole of TNT=227.15 g/mola.    0.11 gb.    0.33 gc.    1.5 gd.    4.6 g -Find the number of moles TNT? -Total moles of Nitrogen in TNT? -Mass of nitrogen atoms in Sample?

5.What is the molecular formula for this compound? a.C2H4O2 b.C2H2O4                                                          c.C4H2O2 d.CH4O2

7.On July 10, 1913, the world-record highest air temperature was recorded to be 134°F at Furnace Creek Ranch in Death Valley, California. What is this temperature in degrees Celsius?(°F – 32) * 5/9 = °Ca.    42°Cb.    74°Cc.    106°Cd.    57°C