Find the weighted mean of the number of sheets on a roll of toilet paper: 7 brands have 22 sheets on a roll of toilet paper, 17 brands have 19 sheets on a roll of toilet paper, 22 brands have 72 sheets on a roll of toilet paper, 19 brands have 78 sheets on a roll of toilet paper.

As a part of a class project, a teacher brings a jar of 200 jawbreakers of three different colors, orange, red and white. Students must estimate the number of white jawbreakers in the jar. Suppose that after the jar is shaken well, one student draws 30 jawbreakers from the jar, of which 9 are orange, 11 are red and 10 are white. Give the students sample statistic for the percent of white jawbreakers in the jar. Round to the nearest whole #.

In a 4 point grade system, an A is worth 4 points, a B is worth 3 points, a C is worth 2 points and a D is worth 1 point.  No points are awarded for an F.  Last semester Tanya received a B in a 4 credit hour course, an A in a three credit hour course, a C in a three credit hour course, and an A in another three credit hour course.  Grade point average (GPA) is calculated as a weighted average using the credit hours as weights and the number of points corresponding to the grades as pieces of data.  Calculate Tanya's GPA for the previous semester.  Round your answer to the nearest hundredth and explain in complete sentences your process.  Show all work.

If your office has 40 workers that work 8hrs a day, what would be your sample? Your population? Why

A certain county had a population of 34,485 people. The county hospital is interested in estimating the number of people in the county with blood type-O. To do this, they test blood samples from 228 patients. Out of this group, 10 have blood type-O. Use this sample to estimate the number of people in the county with blood type-O.

Compute the mean of 91, 10, 45, 73, 41.

Here are the fuel efficiencies (in mpg) of 15 new cars. 49, 35, 17, 21, 27, 23, 45, 50, 39, 51, 41, 47, 25, 14, 29 What is the percentage of these cars with a fuel efficiency less than 40 mpg?

Suppose the degree of student in exams was: 33,22,34,70,83,99,60,41.find mean

If 10 out of 30 students got 22.5, 15 got 40 and 5 got 80 in an exam, which is the weighted average of the grades taken from this exam?

In which year did Tesco have the least number of stores?