Kizspy | Question: 8
(Choose 1 answer)
Let 20.04 1.75, 20.02 = 2.05.
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation 01 40 nours. rrow large a sample is needed if we wish to be 96% confident that our sample mean will be within 10 hours of the true mean?
A. 65
B. 47
C. 68
D. 49
E. None of the other choices is correct
