Question

The mean monthly rent of students at Oxnard University is $820 with a standard deviation of $210.

(a) John’s rent is $1,335. What is his standardized z-score? (Round your answer to 3 decimal places.)

How high would the rent have to be to qualify as an outlier?

John’s rent would have to be $  or higher to be considered an outlier.

Answer 1

X=1335, = 820, =210

formula for z-score is

Z-Score = 2.452

Z-score greater than 3 or less than -3 are concerderd as outliers.

Hence,

No, it is not an outlier

Z-score greater than 3 are concerderd as outliers.

hence, Z = 3

formula for z-score is

we want to find X.

so convert it for X

X = + (Z * )

X = 820 + ( 3 * 210)

X = 1450

John’s rent would have to be $ 1450 or higher to be considered an outlier.