### The average weight of packages shipped by a courier company is 55 kg with a standard deviation of 20 kg.

1.The average weight of packages shipped by a courier company is 55 kg with a standard deviation of 20 kg. In a sample of 100 packages, what is the probability of getting a sample mean between 50 and 60 kg? 0.0062 0.4938 0.5000 0.9876 2.The scores for a group of high school students in a national physics examination were