Hi,

If the mean is 76 and the Standard Deviation is 6 how many students scored below a 70 on their test

  z = (70-76)/6 = -1   using Excel function: NORMSDIST(-1) = .1587   

 P(x < 70) =  15.9 %

 15.9% of the students scored below 70 on their test

 

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