Question 1141826
z=(x-mean)/sd or (x bar-mean)sigma/sqrt(n) if a sample is used
a. z<(950-1000)/117 or <-0.43 and that probability is 0.3336
b. this is z between 0 and 350/117 or between 0 and 3 or 0.4986 probability
c. greater than 1250 cc is z>250/117 or 2.14 for a probability of 0.0162
d. here it is z>(150/117)*sqrt(5) or z>2.87 or probability of 0.0021