I was wondering if I could get help with this stat question

Statistics Nov 10, 2020

I was wondering if I could get help with this stat question. "We measure radioactivity in aaa contaminated cite four times. the values are: 99,100,99,102. The precision of one measurement (standard deviation of measurement error with one measurement) is 2. The allowed value is up to 103. Test the Hypothesis that level is 103. What is the p-value?"