A grocery store sells 5-lb bags of mangoes. You purchase four bags over the course
of a month and weigh the mangoes each time. You obtain the following
measurements:
Week 1 weight: 4.8 lb
Week 2 weight: 5.3 lb
Week 3 weight: 4.9 lb
Week 4 weight: 5.4 lb
Does the measurement have random error?
Does the measurement have systematic error?​