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Author Question: The average time taken to complete an exam, X, follows a normal probability distribution with mean = ... (Read 25 times)

plus1

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on: Jul 24, 2018
The average time taken to complete an exam, X, follows a normal probability distribution with mean = 60 minutes and standard deviation 30 minutes. By what time should 99 of the students have finished the exam? (i.e. What is the 99th percentile for X?)
 a. 85.2 minutes
  b. 89.4 minutes
  c. 129.9 minutes
  d. 150.0 minutes

Question 2

A randomly selected sample of 30 students spent an average amount of 40.00 on a date, with a standard deviation of 5.00 . The standard error of the sample mean is
 a. 0.063
  b. 0.167
  c. 0.913
  d. 5.000


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stano32

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

C

Answer to Question 2

C


plus1

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Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

brbarasa

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Reply 3 on: Yesterday
Wow, this really help

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