Measure of Central Tendency (Exercise)

Exercises
1.The weekly salaries of six employees at McDonalds are $140, $220, $90, $180, $140, $200.  For these six salaries, find: 
                   
                   (a) the mean 
                   (b) the median 
                   (c) the mode
                                                                                                                             Answer
2.Andy has grades of 84, 65, and 76 on three math tests.  What grade must he obtain on the next test to have an average of exactly 80 for the four tests?

                                                                                                                              Answer

3.Test scores for a class of 20 students are as follows:
93, 84, 97, 98, 100, 78, 86, 100, 85, 92, 72, 55, 91, 90, 75, 94, 83, 60, 81, 95 

Test Scores Frequency 91-100  81-90  71-80  61-70 51-60

a) Copy and complete the table shown at the left.b) Find the modal interval.     The "modal interval" is the interval containing the       greatest frequency.  It is not the mode. c) Find the interval that contains the median.                                                                            Answer