The paper is dedicated to theoretically research of the distribution laws used to analyze the experimental testing results of the samples of carbon fiber.Using the computer program MS Excel, case quantities with different distribution laws are modelled as; Exponential distribution, Normal distribution, Log - normal distribution, LW - distribution and Weibull distribution. The ideal theoretical types of distributions are displayed, resulting in histograms and graphs of the empirical distribution function. The study used the test results of 14-groups of carbon fiber sample plates which were exposed to the tension until their collapse. The tests were performed on two types of plates: 3 groups with fiber orientation (0+45-45-90) and 11 groups with orientation (0+45-45-0) in order to be able to compare the obtained collapse limits. An average of 70 carbon plate samples were tested in one group. As a result, the collapse limit in Mpa is obtained for each plate. The publication presents the results of 3 groups of experiments that meet, partially meet and do not meet the theoretical test results with the graphical method according to the normal distribution law.