At their first inaugurations, the first 10 presidents of the United States were
57 61 57 57 58 57 61 54 68 51
years old. Find the mean, median, and mode of the ages of those presidents at their first inauguration.
At a certain company, in a particular month the sales staff met the following percentages of their sales quota:
107 90 80 92 86 109 102 92 353 78 74 102 106 95 91.
Find the mean and median for this set of data. Which of these measures is a better indication of the “central tendency” of this set of data?
An instructor counts the final examination in a course three times as much as each of the three one-hour examinations. What is the average grade of a student who received grades of 72, 86, and 80 in the three one-hour examinations and 90 in the final examination?
In five attempts, it took a person
12 18 14 11 15
minutes to change the oil in a particular make of automobile. Calculate the standard deviation of this sample using
a) the formula which defines s;
b) the computing formula for s.