Two resistors with resistances R1 and R2 are connected in series. The total resistance R is equal to R1 plus R2. R1 has a mean of 50Ω and standard deviation of 5Ω, while R2 has a mean of 100Ω and standard deviation of 10Ω. The document provides the solution that the mean resistance R is 150Ω and the standard deviation of R is 11.2Ω.