Question
Percentage grades in a large physics class follow a normal distribution with mean 58. It is known that 3% of students receive grades less than 39.2. What is the standard deviation of grades in the class?
Answers
You have to find the z-score for .03 from a table. Substitute it below to solve for standard dev.
z-score = (39.2 - 58)/stand.dev.
z-score = (39.2 - 58)/stand.dev.
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