I would really appreciate it if anyone could help me with the following math problem from a homework assignment i have.

The principal at Jonesbury High School has claimed that the mean IQ of all students at the school is 125. The superintendent of schools in Jonesbury wants to test this claim. She checks the files of 36 Jonesbury High students at random, and finds that the mean IQ among these students is 124.8, with a standard deviation of .6. What is the smallest significance level at which the null hypothesis will be rejected? Hint: Calculate the p-value.

Thank you in advance to anyone that can help.