Royal Dogin dog food is sold in packages with an advertised mean weight of 15kgs. The standard deviation is known to be 1.8 kgs. A consumer group wishes to check the accuracy of the advertised mean and takes a sample of 68 packages finding an average weight of 13.8kgs. What is the set of hypotheses that should be used to test the accuracy of advertised weight?

A. Ho: mean = 15kgs, H1: mean different from 15 kgs

B. Ho: mean = 13.8kgs, H1: mean different from 13.8 kgs

C. Ho: mean = 15kgs, H1: mean > 15 kgs

D. Ho: mean = 13.8kgs, H1: mean < 13.8 kgs