How would I get the p-value?

A report states that the cost of repairing a hybrid vehicle is falling even while typical repairs on conventional vehicles are getting more expensive. The most common hybrid repair, replacing the hybrid Inverter assembly, had a mean repair cost of $3,927 in 2012. Industry experts suspect that the cost will continue decrease given the increase in the number of technicians who have gained expertise on fixing gas-electric engines in recent months. Suppose a sample of 100 hybrid inverter assembly repairs completed in the last month was selected. The sample mean repair cost was $3,780 with the sample standard deviation of $500. Complete parts (a) and (b) below. HoiH 2 $ 3927 H