Mercury is a persistent and dispersive environmental contaminant found in many ecosystems around the world. when released as an industrial by-product, it often finds its way into aquatic systems where it can have deleterious effects on various avian and aquatic species. the accompanying data on blood mercury concentration (mu g/g) for adult females near contaminated rivers in a state was read from a graph in an article. 0.21 0.22 0.26 0.30 0.34 0.42 0.55 0.56 1.43 1.70 1.84 2.20 2.25 3.06 3.26 determine the values of the sample mean and sample median.

The sample mean is and the sample median is 0.56

Step-by-step explanation:

The sample mean of observations is given by

Applying the above definition we get that

The sum of these 15 sample observations is

and the sample mean is

The sample median is obtained by first ordering the n observations from smallest to largest (with any repeated values included so that every sample observation appears in the ordered list). Then,

Sample median = The single middle value if n is odd =

Sample median = The average of the two middle values if n is even = average of and

Applying the above definition we get that

The data is already ordered and n = 15 so,

Sample median =   = 0.56

i can't see the picture : /