The investigation of impact strength (first crack strength N1 and failure strength N2) of two different type of steel fibre reinforced concretes (FRC) subjected to drop weight test was statistically commanded in this paper. For this purpose, a former researcher results were statistically investigated using two parameter Weibull distributions and presented the impact strengths in terms of reliability function. Furthermore, the Weibull parameters were determined by two estimation approaches such as least-squares (LS) regression of Y on X and least-squares (LS) regression of X on Y.Analysis suggested that the both the methods are more effective to estimate the Weibull parameters accurately due to that the deviation between the Weibull parameters obtained from the two methods was very less. In this respect, designer can choose the impact strength design value based on the required reliability. © 2006-2016 Asian Research Publishing Network (ARPN). All rights reserved.