In a study of red blood cell counts (10⁻³ x cells per mm³) of 15 lizards, the average was 843.4. Identify the standard deviation (SD) and standard error (SE).
a) SD: 64.9, SE: 251.2
b) SD: 251.2, SE: 64.9
c) SD: 843.4, SE: 64.9
d) SD: 64.9, SE: 843.4
