A person can copy final exams in 14 minutes using a new copy machine. Using an old copy machine, the same job takes 35 minutes. If both copy machines are used, how long will it take to copy the final exams?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?

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