To test the durability of a new paint for white centre lines, a highway department has painted test strips across heavily travelled roads in eight different locations, and automatic counters showed that they deteriorated after having been seen crossed by(to the nearest hundred) 142,600, 167,800, 136,500, 108,300, 126,400, 133,700, 162,000 and 149,400 cars. Construct a 95% confidence interval for the average number crossing this paint can withstand before it deteriorates.