The director of cost management for Odessa Company uses a statistical control chart to help management determine when to investigate variances. The critical value is 1 standard deviation. The company incurred the following direct-labor efficiency variances during the first six months of the current year. The standard direct-labor cost during each of these months was $19,000. The controller has estimated that the firm's monthly directlabor variances have a standard deviation of $950. Required: 2-a. Determine the cutoff value for investigation if the controller's rule of thumb is to investigate all variances equal to or greater than 6 percent of standard cost. 2-b. Based on the cutoff value, which month will have its direct-labor efficiency variance investigated? Determine the cutoff value for investigation if the controller's rule of thumb is to investigate all variances equal to or greater than 6 percent of standard cost. Based on the cutoff value, which month will have its direct-labor efficiency variance investigated