If three samples have means of 10, 20, and 15, respectively, what is their grand mean?

Ratio and Proportion 30)  57 books to 95 students, how many books to 5 students?

An organizational psychologist conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a job-skills training program. The cutoff t needed is -1.833. The standard deviation of the distribution of means of change scores is 2.0, and the mean change score for the sample studied is an increase of 5.2. What is the t score?

Fractions reduce to lowest terms 31)

Divide 16)

Solve 36)  7000mg = How many grams?

Ratio and Proportion 27)  216 pies to 27 sales.  How many pies are to 2 sales?

Divide 19)

Divide 18)  

If two methods in the same class have the same name but different parameters, the second overrides the first.