Question

a. Draw a normal curve on which the mean (90 minutes) and the standard deviation (7...

a. Draw a normal curve on which the mean (90 minutes) and the standard deviation (7 minutes) are correctly located.
b. What percent of students used more than 90 minutes but less than 100 minutes to complete the exam? Show your work.
c. 10% of students used more than how many minutes to complete the exam? Show your work

Math   Statistics-And-Probability   
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Answer #1

a)

(Z is standard normal variate i.e. Z~N(0,1))

=0.423

42.3%

  

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10 c) P(X > x) = = 0.1 100

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