Consider a population that consists of the 55 students enrolled in a statistics course at a large university. If the university
registrar were to compile the grade point averages (GPAs) of all 55 students in the course and compute their average, the result would be a mean GPA of 3.15. Note that this average is unknown to anyone; to collect the GPA information would violate the confidentiality of the students’ academic records. Suppose that the professor who teaches the course wants to know the mean GPA of the students enrolled in his course. He selects a sample of students who are in attendance on the third day of class. The GPAs of the students in the sample are:
3.89 4.00 3.85 3.77 3.81 3.43 3.28 3.27 3.56 3.92
The instructor uses the sample average as an estimate of the mean GPA of his students. The absolute value of the error in the instructor’s estimate is:
Let the time spent by 181818 people to paint 181818 walls be X. we can calculate for X by using this formula. 666: 343434 minutes 181818:X cross multiply 666X=343434 x 181818 X=93757482