Explain how you can quickly calculate the average of the following list of test scores without adding the numbers: 4. 81 78, 79, 82

Explain the meaning of the terms rounding error, truncation error, total error and relative error percentage by giving examples.

How did you get 52.5 from 9.25/7?

46,795 runners finished the 2011 New York marathon. The 1981 marathon had 13,203 finishers. What was the percentage increase in runners who finished ?

The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level.  Suppose a sample of 2552 tenth graders is drawn. Of the students sampled, 2119 read above the eighth grade level. Using the data, estimate the proportion of tenth graders reading at or below the eighth grade level. Enter your answer as a fraction or a decimal number rounded to three decimal places.

Order these numbers from least to greatest. .6.552, , 6.7 13 , 6.71 13 6.552 6.71 2.

What expression can be used for estimating 868 divided by 28

82 students at a college were asked whether they had completed their required English 101 course, and 52 students said "yes". Find the best point estimate for the proportion of students at the college who have completed their required English 101 course. Round to four decimal places.

find 5 number summary   50.2,50.6,50.8,50.9,51.0,51.2,51.3,51.3,51.4,51.5,51.8,52,52.4,52.9,53

why is zero important in a place value system?