An instructor in a large lecture class found, at the end of the semester, that the total point distribution in his class was approximately normal, with a mean of 530 and a standard deviation of 80. if 10% of the class is to receive a’s (the instructor grades on a curve), what is the lowest number of points that a student can have and still earn an a?

The lowest number of points that a student can have and still earn an A is 632.

Step-by-step explanation:

Since we have given that

Mean = 530

Standard deviation = 80

If 10% of the class is to receive A's, then we need to find the lowest number of points that a student can have and still earn an A.

Let X be the number of points.

so,

so, it becomes,

From the Z-table, we get that

So, we get that

Hence, the lowest number of points that a student can have and still earn an A is 632.

step-by-step explanation:

y=mx+b

you can't solve x because it is 2 linear equation and you only have one equation