Determining the relevant variables variable characteristics and system rules best describes which major simulation study phase? Define the service system Select software and construct the model Validate and run the model Plan the study Which of the following statements about the normal distribution is not correct O A normal distribution is sometimes informally called a bell curve O The nomal distribution is symmetric about its mean The normal distribution is determined by its mean and standard deviation About 99% of values drawn from a normal distribution are within two standard deviations (o) away from the mean