- A sample of 10 measurements has a mean of 15.7 and a sample of the other 20 measurements has a mean of 14.3. Find the mean of all 30 measurements.
Give your answer correct to one decimal place.

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Def rotates 90 clockwise about point a to create d’ e’ f’. therefore, which equation must be true ?