Hi I need help with this question,

A truck loaded with8000electronic circuit boards has just pulled into a firm's receiving dock.The supplier claims that no more than3%of the boards fall outside the most rigid level of industry performance specifications.In a simple random sample of300boards from this shipment,12falloutside these specifications.

Calculate the upper and lower confidence limit ofthe95%confidence interval for the percentage of all boards in this shipment thatfalloutside the specification.