Each mechanic in a shoe factory produces an average of 50 defective parts every day. The known variance of the number of defectives by a mechanist is 4 per day. On a randomly chosen day, a sample of 35 mechanist produced an average of 51 defectives part. At 5% level of significance, is evidence that the mechanists are producing too many defectives parts, on average?

	A.	Statistically, there is evidence that the mechanists are producing too many defectives parts
	B.	This cannot be determined
	C.	None of the above
	D.	Statistically, there is no evidence that the mechanists are producing too many defectives parts