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## A standardized​ exam’s scores are normally distributed. In a recent​ year, the mean test score was 1526 and the standard deviation was 313. The test scores of four students selected at random are 1920​, 1250​, 2250​, and 1400. Find the​ z-scores that correspond to each value and determine whether any of the values are unusual. The​ z-score for 1920 is nothing. ​(Round to two decimal places as​ needed.) The​ z-score for 1250 is nothing. ​(Round to two decimal places as​ needed.) The​ z-score for 2250 is nothing. ​(Round to two decimal places as​ needed.) The​ z-score for 1400 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.   Click to select your answer(s).

A standardized​ exam’s scores are normally distributed. In a recent​ year, the mean test score was

1526

and the standard deviation was

313.

The test scores of four students selected at random are

1920​,
1250​,
2250​,

and

1400.

Find the​ z-scores that correspond to each value and determine whether any of the values are unusual.

The​ z-score for

1920

is

nothing.
​(Round to two decimal places as​ needed.)
The​ z-score for

1250

is

nothing.
​(Round to two decimal places as​ needed.)
The​ z-score for

2250

is

nothing.
​(Round to two decimal places as​ needed.)
The​ z-score for

1400

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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