7. A wildlife biologist is investigating the length of flippers for different species of penguins. She collects her data on the penguins and records the flipper length and the species. Then she runs an ANOVA test using her statistical software and sees the following output:

How many total penguins did she measure for her sample?

[tex]$
n=\text{ ? }
$[/tex]

A. 337
B. 339
C. 342
D. 341
E. 340