26 The number of nance majors within the School of Business is an example of IA a continuous random variable A the Poisson distribution A a discrete random variable IA the normal distribution IA a constant 27 A researcher wants to determine the sample size necessary to adequately conduct a study to estimate the population mean to Within 5 points. The range of population values is 80 and the researcher plans to use a 90% level of condence. The sample size should be at least A 692 AI216 A 44 A 62 A700 28 The number of cars arriving at a toll booth in ve-minute intervals is Poisson distributed with a mean of 3 cars arriving in ve-minute time intervals. The probability of 5 cars arriving over a five-minute interval is (\"30.1500 (\"10.1008 (70.0940 (10.0417 (\"20.2890 29 The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 75 hours. Tests show that the life of the bulb is approximately normally distributed. It can be concluded that approximately 68% of the bulbs will last between A975 and 1475 hours A 1125 and 1275 hours A 1050 and 1350 hours A900 and 1100 hours A950 and 1050 hours 30 The weight of a USB ash drive is 30 grams and is normally distributed. Periodically, quality control inspectors at Dallas Flash Drives randomly select a sample of 17 USB ash drives. If the mean weight of the USB ash drives is too heavy or too light the machinery is shut down for adjustment; otherwise, the production process continues. The last sample showed a mean and standard deviation of 31.9 and 1.8 grams, respectively. Using a = 0.10, the appropriate decision is A fail to reject the null hypothesis and shut down the process A fail to reject the null hypothesis and do not shut down the process) do nothing A reject the null hypothesis and do not shut down the process A reject the null hypothesis and shut down the process