Which form most quickly reveals the vertex?
2 answers:
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Answer:
Marta need to score at least 94 to receive an average of 90 or higher considering all five tests.
Explanation:
Marks received by Marta in four tests = 86, 84, 97 and 89
Let mark received in fifth test be x
We have average of five test is more than or equal to 90
So we have
So Marta need to score at least 94 to receive an average of 90 or higher considering all five tests.
If is a random variable representing test scores, then the 41st percentile is the score
such that
. Transform
to the random variable
that follows the standard normal distribution via
:
The -score for the 41st percentile is about -0.2275, so