The number of fluorosis cases reported during the last years in a town are 250, 320, 190, 300, 5000, 100, 260, 350, 320, and 160. The epidemiologist wants to find  out the average number of fluorosis cases reported in that town during the last 10 years. The most appropriate measure of average for this data will be:
In the given question,

Incidence of fluorosis in an area is 250, 320, 190, 300, 5000, 100, 260, 350, 320, and 160.
And, incidence in ascending order is 100, 160, 190, 250, 260, 300, 320, 320, 350, 5000.
Mean = 7250/10 = 725
Median = Mean (average) of 5th and 6th value = (260 + 300)/2 = 280

Mode = 320

Since extreme values (outliers) are present for incidence (20 and 5000), mean will not be an appropriate measure of central tendency,

  Thus, median will be the most suitable measure of central tendency.
Arithmetic mean
Mode
Median
Geometric mean