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Harrizon [31]
2 years ago
12

Amanda earned a score of 940 on a national achievement test that was normally distributed. The mean test score was 850 with a st

andard deviation of 100
If 1000 students took the test, how many scored below Amanda? Use z table.
Mathematics
2 answers:
SVETLANKA909090 [29]2 years ago
7 0

Answer:

<h3><u>L</u><u>o</u><u>w</u><u>e</u><u>r</u><u> </u><u>t</u><u>h</u><u>a</u><u>n</u><u> </u><u>A</u><u>m</u><u>a</u><u>n</u><u>d</u><u>a</u> : 816 students.</h3>

hichkok12 [17]2 years ago
6 0

Answer:

lower than Amanda:  816 students

Step-by-step explanation:

An equivalent way in which to state this problem is:  Find the area under the standard normal curve to the left (below) 940.

Most modern calculators have built in distribution functions.

In this case I entered the single command   normalcdf(-1000,940, 850, 100)

and obtained 0.816.

In this particular situation, this means that 0.816(1000 students) scored lower than Amanda:  816 students.

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