Standard deviation of data-students are within twelve points

Reference no: EM13117044

The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or below) the mean?

A) 5.875
B) 9.375
C) 10.375
D) 14.5
E) Cannot be determined

Reference no: EM13117044

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