A federal inspector for weights and measures visits a packaging plant to confirm that the net weight of packages is as indicated on the packages. The plant manager assures the inspector that the packaging process results in a mean weight of 750 grams and a standard deviation of 12 grams. The inspector selects 36 packages at random and finds their mean weight to be 753 grams. If the manager’s statement is correct, how likely is a sample mean of 753 grams or more? After finding the probability that the sample mean is at least 753 grams, indicate the interval below that contains this probability.
ç”æ¡ˆé€‰é¡¹ç»„: 0.0500 to 0.0999, 0.7500 to 0.9500, 0.1000 to 0.7499, 0.0000 to 0.0499, 0.9501 to 1.000