Fix issue #33

Author: VectorPosse

05_Manipulating_data.Rmd

@@ -401,7 +401,7 @@ One note of explanation in the `mean` command: there is an argument `na.rm`. Thi
 hf_mutate2[93, ]
 ```
 
-Notice that the all the times are missing. There are a bunch of rows like this. Since there is not always an arrival delay listed, the `ArrDelay` variable doesn't always have a value, and if `ArrDelay` is `NA`, the `late` variable will be too. So if we try to calculate the mean with just the `mean` command, this happens:
+Notice that all the times are missing. There are a bunch of rows like this. Since there is not always an arrival delay listed, the `ArrDelay` variable doesn't always have a value, and if `ArrDelay` is `NA`, the `late` variable will be too. So if we try to calculate the mean with just the `mean` command, this happens:
 
 ```{r}
 mean(hf_mutate2$late)