In a certain chemical, the ratio of zinc to copper is 3 to 11. A jar of the chemical contains 385 grams of copper. How many gra
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Answer: z= -1.636
Step-by-step explanation:
When population standard deviation is known, then the test statistic is given by :-
, where = sample mean,
= population mean, n=sample size ,
= standard deviation
As per given,
Hence, the e test statistic to see whether the candy bars are smaller than they are supposed to be : z= -1.636