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In a class population with an average of 60 variances of 121 a) What is the...

In a class population with an average of 60 variances of 121
a) What is the probability that a student's grade is between 50 and 70 in this population?
b) How many people's grades are between 50 and 70 in a group of 2000 students? Compute?

Math   Statistics-And-Probability   
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