Ultimate math quiz:
jim weighs 30 pounds less than tom, and together they weigh 210 pounds. let n = tom's weight in pounds.
a class of 19 pupils has five more girls than boys. let n = the number of boys.
two sides of a triangle are equal in length and double the length of the shortest side. the perimeter of the triangle is 36 inches.

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed