The time required for assembly by skilled labor was measured on 25 units of the same type of transistorized assembly. The average time was 10.2 minutes with a standard deviation of 1.8 minutes. What is the margin of error of this confidence interval, for the actual average assembly time, with a 90% confidence level? - 0.474 - 0,743 - 1,007 - 0,616 - 0,535