Normal distribution GPA

The average GPA is 2.78 with a standard deviation of 4.5. What are students in the bottom the 20% having what GPA?

Correct result:

x =  0.3106

Solution:

$x=0.3106$

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Dr Math

checkout https://www.hackmath.net/en/calculator/normal-distribution?mean=2.78&sd=4.5&above=1.56&area=below&below=0.556&ll=-1.56&ul=1.56&outsideLL=-1.56&outsideUL=1.56&draw=Calculate

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