I want to let you know that I do not use the excel formula =NORMSINV(0.1) (Example) I have to use the Z-Table chart and z = x - /??n or r/?n

1. The monthly income of 5,000 workers at the Microsoft plant are distributed normally. Suppose the mean monthly income is $1,250 and the standard deviation is $250. Choose an appropriate Minitab result to answer the following questions.

Normal with mean = 1250 and standard deviation = 250 X P( X S X ) 750 0.0228 Normal with mean = 1250 and standard deviation = 250 X P( X S X ) 1500 0.8413