Homework Help: statistics

Posted by Katie on Sunday, February 24, 2013 at 9:17pm.

In a normal distribution with mu = 25 and sigma = 3, what number corresponds to z = -3?
is it 16, 18, or 20

statistics - MathGuru, Monday, February 25, 2013 at 4:43pm
Formula:

z = (x - mean)/sd

Plug in the numbers you know from the problem:

-3 = (x - 25)/3

Solve for x.

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