Package weights again. Some students checked 6 bags of Doritos marked with a net weight of 28.3 grams. They carefully weighed the contents of each bag, recording the following weights (in grams): 29.2, 28.5, 28.7, 28.9, 29.1, 29.5. (Data in Doritos)

a) Do these data satisfy the assumptions for inference?
Explain.

b) Find the mean and standard deviation of the weights.

c) Test the hypothesis that the net weight is as claimed.