What is the average screen size of the iPhone models except the model with the largest screen size? mean(xxxx[which(screen_size xxx xxx(screen_size))]) Please complete the code. You can only use a vector name, function name, or logical comparison in each blank. mean([Fill in the blank] [which(screen_size [Fill in the blank] [Fill in the blank] (screen_size))])   多项填空题

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Suppose you created a vector as follows: mid_score <- c(20, 30, 10, 40). What would the following code return when executed properly? sum(which(mid_score > 20))

Suppose you created a vector as follows: mid_score <- c(20, 30, 10, 40). What would the following code return when executed properly? sum(which(mid_score > 20))

except_the_first <- model[-1] The above code creates a vector (named except_the_first) consisted of model names except the first model name in the model vector (i.e., a vector consisting of values in all positions except the first position in model vector).

100 students take an exam and each gets an integer mark between 0 and 100, but 10 of the 100 students are absent on the day and receive a 0. The marks are stored in an R variable called marks and you are interested in calculating the average mark of the students that DID take the exam. Which of the following expressions can be used to compute this? For this question, you can assume that none of the students who attended the exam received a 0.

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