Based on annual driving of 14,600 miles and fuel efciency of 20 mpg, a car in the United States uses, on average, 730 gallons of gasoline per year. If annual automobile fuel usage is normally distributed, and if 29.12% of cars in the United States use less than 510 gallons of gasoline per year, what is the standard deviation? (Round your answers and 2 values to 2 decimal places, 9.3. 125. Round your answer to 3 decimal places, ea. 2.53 1.) E Determine the mean and standard deviation of the following exponential distributions. (a) 1 = 3.25 (b) 1 = 0.7 (c) 1 = 1.1 (d) 1 = 6.0 (Round your answers to 2 decimal places, e.g. 0.12.) (a) H = 0.307692 O = 0.094675 (b) 1.428571 O = 2.040816 (c) H = 0.909091 O = 0.826446 (d) H = 0.166667 0= 0.027778Determine the following exponential probabilities. (Round your answers to 4 decimal places, e.g. 0.2531.) (a) P(x 2 4|1 = 1.15) (b) P(x 3 | 1 = 1.6) (d) P(x