This table shows the distribution of grades in an operations management class. Add a column to the table that shows the cumulative probability and indicate what letter grade is obtained when the RAND()function is equal to 0.982245
A)A
B)B
C)C

Question

This table shows the distribution of grades in an operations management class.  Add a column to the table that shows the cumulative probability and indicate what letter grade is obtained when the RAND()function is equal to 0.982245
A)A 
B)B 
C)C

Quizplus · Accepted Answer

To calculate the cumulative probability, we need to add up the probabilities of all the grades up to the grade in question.

For example, to calculate the cumulative probability for a grade of B, we would add up the probabilities for grades of A and B: 0.1 + 0.3 = 0.4.

Similarly, the cumulative probability for a grade of C would be 0.4 + 0.25 = 0.65.

And the cumulative probability for a grade of D would be 0.65 + 0.15 = 0.8.

Finally, the cumulative probability for a grade of F would be 0.8 + 0.2 = 1.0.

Therefore, the letter grade obtained when the RAND() function is equal to 0.982245 would be B, as this corresponds to a cumulative probability of 0.4.

This Table Shows the Distribution of Grades in an Operations