Normal distributions-distribution of sums

Reference no: EM1392071

A straight rod is formed by connecting three sections A, B and C, each of which is manufactured on a different machine. The length of section A, in inches has a normal distribution with mean 20 and variance 0.04. The length of section B, in inches, has a normal distribution with mean 14 and variance 0.01. The length of section C, in inches, has a normal distribution with mean 26 and variance 0.04. The three sections are joined so that there is an overlap of 2 inches at each connection. The rod is used in construction of an airplane wing if its total length is between 55.7 and 56.3. What is the probability that the rod can be used?

Reference no: EM1392071

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