A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was 1463 and the standard deviation was 315. The test scores of four students selected at random are 1860​, 1220​, 2170​, and 1360.

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A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was
1463
and the standard deviation was
315.
The test scores of four students selected at random are
1860​,
1220​,
2170​,
and
1360.
Find the​ z-scores that correspond to each value and determine whether any of the values are unusual.
The​ z-score for
1860
is
nothing.
​(Round to two decimal places as​ needed.)
The​ z-score for
1220
is
nothing.
​(Round to two decimal places as​ needed.)
The​ z-score for
2170
is
nothing.
​(Round to two decimal places as​ needed.)
The​ z-score for
1360
is
nothing.
​(Round to two decimal places as​ needed.)
Which​ values, if​ any, are​ unusual? Select the correct choice below​ and, if​ necessary, fill in the answer box within your choice.
 
 
A.
The unusual​ value(s) is/are
nothing.
​(Use a comma to separate answers as​ needed.)
 
B.
None of the values are unusual.
 
 
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