I can't determine number of observations in the 8 win strata for baseball.

Hi there,

I am trying to answer the question below;
How many observations are in the 8 win strata?
with this code;
Teams_stratified <- Teams_small %>%
mutate(W_strata = round(W/10, 1)) %>%
filter(W_strata >= 5 & W_strata <= 10)
my answer choices so far are all wrong; I don't know what happened. I need help. Thank you.