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Author Question: Calculate the sample standard deviation. What will be an ideal ... (Read 56 times)

sam.t96

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on: Jun 24, 2018
Calculate the sample standard deviation.
 
  What will be an ideal response?

Question 2

The time it takes to assemble an electronic component is normally distributed with a mean of 17.2 minutes and a standard deviation of 3.1 minutes. The probability is 90 that it will take at least how long to assemble a component?
 
  What will be an ideal response?


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ErinKing

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Reply #1 on: Jun 24, 2018
Answer to Question 1

s = 0.70

Answer to Question 2

P(X > k) = 0.90  PZ > (k - 17.2 )/3.1 = 0.90 (k - 17.2 ) /3.1 = -1.28,  k = 13.23 minutes


sam.t96

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Reply #2 on: Jun 24, 2018
Thank you :)


ErinKing

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Reply #3 on: Jun 24, 2018
Happy to help you


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