Math sticker meanings

Question

I am trying to understand what these stickers mean.

The ones on the top row are:

Good one!
I am impressed!
(I know $\sum x_n /n$ is the mean of the $x_i$, but I don't understand this one)

The bottom row is:

I think the $\cos$ in the 5th is "because". – Botond Oct 21 '18 at 22:25 — Botond, Oct 21 '18 at 22:25
This work is above average is the third one. – Joel Pereira Oct 21 '18 at 22:28 — Joel Pereira, Oct 21 '18 at 22:28
This question may be more appropriate at Puzzling. – Xander Henderson Oct 21 '18 at 23:42 — Xander Henderson, Oct 21 '18 at 23:42

score 3 · Accepted Answer · edited Oct 21 '18 at 23:54

3

3: "This work is above average" ($\sum{x}_n/n$ is indeed the average)

5: "Complementary - this is good work" (cosine is the complementary angle of sine)

edited Oct 21 '18 at 23:54

amWhy

answered Oct 21 '18 at 22:27

bjcolby15

5

5 is close, but not quite right. "Complementary cos" should be read as "Complementary, 'cause". So, it should be "Complementary, 'cause this is good work!" – Grey Matters Oct 21 '18 at 22:40
Good catch! You could also read it as "A complement...this is good work!" – bjcolby15 Oct 22 '18 at 09:53

1 Answers1