We collected a sample of the prices of new homes. the mean of our sample is $250,000, with a standard deviation of $15,000. calculate the z-scores of each of the given prices. determine if the they are usual or unusual. round up each z-score to two decimals.

(a) $200, 000

(b) $155,000

(c) $275,000

(d) $322,000

choose one •

a
-3.33, unusual
-6.33, unusual
1.67, usual
4.80, unusual

b
3.33, usual
6.33, unusual
-1.67, usual
-4.80, unusual

c
-3.33, usual
-6.33, usual
-1.67, unusual
-4.80, usual

d
3.33, unusual
6.33, unusual
1.67, usual
4.80, unusual