A researcher is testing the hypothesis that the mean life of a mini-bulb used in experiments has a mean life greater than 100 hours. He collects a sample of 16 bulbs and determines the sample mean life to be 80 hours. The bulb manufacturer informs the researcher that the bulb life has a standard deviation of 40 hours (i.e. the population standard deviation is 40 hours). Assume bulb life follows a Normal distribution. Given this information, the p-value for the hypothesis test will be:

50%

97.72%

2.28%

p-value cannot be determined for this test because the sample mean is less than hypothesized mean