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Author Question: A variable is normally distributed with a mean of 100 and a standard deviation of 10. Which is ... (Read 23 times)

Marty

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on: Jul 25, 2018
A variable is normally distributed with a mean of 100 and a standard deviation of 10. Which is larger, the percentage of observations between 80 and 90 or the percentage of observations between 120 and 130? Explain your reasoning.
 
  What will be an ideal response?

Question 2

The scores from a state standardized test have a mean of 80 and a standard deviation of 10. The distribution of the scores is roughly bell shaped. Use the Empirical Rule to find the percentage of scores that lie between 60 and 80.
 
  A) 47.5 B) 34 C) 68 D) 95


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karlss

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Reply #1 on: Jul 25, 2018
Answer to Question 1

Answers will vary. Possible answer: The percentage of observations between 80 and 90 is larger. Both intervals have the same length, but the interval (80,

Answer to Question 2

A


Marty

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Reply 2 on: Jul 25, 2018
YES! Correct, THANKS for helping me on my review

Liddy

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Reply 3 on: Yesterday
Excellent

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