Please help me with this stats. question :)?

Claude manages a plant that manufactures light bulbs. Claude is interested in finding out the average lifetime of a new model of a 100-watt light bulb that he is producing. The average lifetime for the population of 100-watt light bulbs produced by his competitor is about 40 hours. Claude wishes to test whether the average lifetime for his new-model bulbs is greater than that of his competition on average. The manufacturer decides to test his theory at a 0.10 significance level. What is the chance of making a Type I error? (write the numerical answer as a decimal)