SOLUTION: An Epson inkjet printer advertises that the black ink cartridge will provide enough ink for an average of 245 pages. Assume this claim is accurate and that the standard deviation f

Algebra ->  Probability-and-statistics -> SOLUTION: An Epson inkjet printer advertises that the black ink cartridge will provide enough ink for an average of 245 pages. Assume this claim is accurate and that the standard deviation f      Log On


   

Question 1029061: An Epson inkjet printer advertises that the black ink cartridge will provide enough ink for an average of 245 pages. Assume this claim is accurate and that the standard deviation for this population is 15 pages. A random sample of 33 customers was surveyed about the number of pages they were able to print with their black ink cartridges. What the probability that the sample mean will be 246 pages or less?
A. 0.8729
B. 0.6480
C. 0.3520
D. 0.1093
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Probability should be greater than 50% but not too much.
t df=32<(246-245)/(15/sqrt(33))
t< 1/2.6111=0.3830
probability is 0.6479
B.