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Author Question: Scores on an aptitude test are normally distributed with a mean of 400 and a standard deviation of ... (Read 134 times)

TFauchery

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on: Jul 25, 2018
Scores on an aptitude test are normally distributed with a mean of 400 and a standard deviation of 60. Explain how you would find any given percentile.
 
  What will be an ideal response?

Question 2

If the probability of a newborn kitten being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the binomial distribution.
 
  A) 0.7967 B) 0.8159 C) 0.1841 D) 0.0606


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jackie

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

Answers will vary. Possible answer: Sketch a normal curve and shade the area associated with the given percentage. Use a table of areas for the standard normal curve to find the z-score delimiting the shaded area. Find the x-value corresponding to the z-score by using x =  + z.

Answer to Question 2

C


TFauchery

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Reply #2 on: Jul 25, 2018
Thanks


jackie

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Reply #3 on: Jul 25, 2018
Welcome :)


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