1. The lognormal distribution is identified as a model for concentration of a certain organic matter above a certain stretch of a highway. The parameters of this distribution are sigma = 1.9 and sigma = 0.9. a) Determine the expected value and the standard deviation of such distribution. b) The probability that the concentration of this compound will be at least 10. 2. I have absolutely no clue how to do this. My instructors lectures are next to useless and give pretty much no help. 3. See #2.