)<\u002fcode>", html = TRUE, class = c("html",     "character")), correct = FALSE, message = structure("Try again! The scoped verb you&#39;re looking for is <code>summarize_at()<\u002fcode>", html = TRUE, class = c("html",     "character"))), class = c("tutorial_question_answer", "tutorial_quiz_answer")), structure(list(id = "lnr_ans_4921e9a", option = "`penguins %>% \n  group_by(year) %>% \n  summarize_at(vars(c(bill_length_mm, bill_depth_mm)), sd)`",     value = "`penguins %>% \n  group_by(year) %>% \n  s