The white blood cell counts of a population of patients were taken, and the results showed that the mean was 7530 white blood cells (WBC) per microliter (mcL). The standard deviation of the data was 50. Which statement below is true for this data and this population of patients?
a) The majority of patients have WBC counts below 7530.
b) All patients have exactly 7530 WBC.
c) The WBC counts have a wide variation around the mean.
d) The mean WBC count is irrelevant for this data.