In a distribution where the mean is 80 and the standard deviation is 5, find the largest fraction of the numbers that could meet the following requirements. Less than 70 or more than 90.

Answer 1

Prob ( x < 70 ) or Prob(x>90) = Prob ( x < -2) or Prob (x>2) = Prob(x<-2) + 1 - Prob(x<2)

= 0.045500264