Can anyone who has completed the r course tell me what is wrong with this code?

Question

m <- mean(mtcars$mpg)
s <- sd(mtcars$mpg)
a <- m+s
b <- m-s

c <- mtcars[mtcars$mpg<=a || mtcars$mpg>=b,]
print(nrow(c))

Answer 1

Will

There should be & instead of ||

Answer 2

Thanks AJ.