A class has 136 students. The time it takes to grade one exam paper is on...
A class has 136 students. The time it takes to grade one exam paper is on average 3 minutes and has
standard deviation 90 seconds. Estimate the probability that it will take less than 7 hours for one
person to grade all of the exams.
Homework Answers
The probability that it will take less than 7 hours for one person to grade all of the exams
.............................................90
seconds = 1.5 minute
=P[Z<2.67]
=0.9962...........................by using normal probability table or Excel command =NORMSDIST(2.67)
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