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Hi please help 100 points!!

(this is a review question)
(any absurd answers will be reported)

Hi please help 100 points!! (this is a review question) (any absurd answers will be-example-1
User RoelVB
by
7.6k points

1 Answer

1 vote

Answer:

154.3

Explanation:

You want to know the score needed to be in the top 10% if scores are normally distributed with a mean of 130 and a standard deviation of 19.

Inverse normal

The inverse normal function gives you the z-value corresponding to a given area under the standard normal curve. A suitable calculator can scale that according to the mean and standard deviation you have.

The calculator display shown in the attachment puts the cutoff for the top 10% at a score of 154.3.

The minimum score needed is 154.3.

__

Additional comment

The above score is rounded down to the nearest 10th. That means a score of 154.3 will not actually be in the top 10%. Rather, it will be in the top 10.046%. The minimum score that will actually be in the top 10% would be 154.4.

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Hi please help 100 points!! (this is a review question) (any absurd answers will be-example-1
User Sukhbir
by
8.1k points

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