Please explain how to arrive at the answer for Question 4c? How do we arrive at $1508 please?

Question 4. The mean monthly rent of students at Oxnard University is $890 with a standard deviation of $206. (a) John's rent is $1,395. What is his standardized z-score'? (Round your answer to 3 decimal places.) 2 2.4515 2.4515 correct. (b) Is John's rent an outlier? Yes Correct (c) How high would the rent have to be to qualify as an outlier? John's rent would have to be $ 1508 1508 correct. or higher to be considered an outlier