The following table lists the age at death of 60 people of a region decades ago. At the significance level of 0.05, test the assumption that the age at death of people of this particular region has the normal distribution:
51, 56, 53, 67, 58, 64, 43, 59, 54, 47, 56, 68, 69, 48, 56, 64, 59, 60, 55, 54, 44, 51, 56, 58, 57, 44, 66, 57, 54, 59, 56, 67, 54, 48, 64, 58, 53, 50, 63, 45, 56, 72, 42, 52, 58, 61, 51, 59, 55, 57, 49, 74, 62, 53, 67, 59, 49, 78, 73, 80