(5-7 min pentru rezolvare)
Diameters of balls are normally distributed about the mean of 120 mm with a standard deviation of 3 mm. A random sample of 45 balls is selected. What is the probability that the average diameter will be less than 119 mm?
!!! Important !!!
When computing z do not approximate, calculate everything in one formula.
After computing z value, approximate the value up to 2 digits after the comma.
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