An experiment consists of randomly drawing one marble from a bag containing 7 purple, 4 blue, and 3 green marbles. what is the probability of selecting a purple marble from the bag if the answer is expressed as a fraction?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?