What is the standard deviation of the data set {6, 8, 6, 11, 8, 8, 9}? round to the nearest tenth

The blue whale is the largest animal living on the earth. the average blue whale measures 100 feet long (30 meters) and weighs 300,000 pounds (136,000 kilograms). a whale’s head is 1⁄3 of the length of its body. a new baby whale is 1⁄4 the length of a grown whale. the average man is 1⁄17 the length of a blue whale, and 1⁄1,818 its weight. a human baby measures 1⁄4 of the length of an adult. calculate the following information: how long is a whale’s head? how long is a new baby whale? how tall is the average man? how much does the average man weigh? how tall is the average human baby?

What is the value of x when x + 7 = 21?

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab