The time required to assemble an electronic component is normally distributed with a mean of 12 minutes and a standard deviation of 1.5 min. find the probability that the time required to assemble all

The time required to assemble an electronic component is normally distributed with a mean of 12 minutes and a standard deviation of 1.5 min. find the probability that the time required to assemble all nine components (i.e. the total assembly time) is greater than 117 minutes.