☑Kizspy.me
(Choose 1 answer)
The life in hours of a 75-watt light bulb is known
☐ A
to be normally distributed with standard
deviation 25 hours. A random sample 20
bulbs has a mean life of 1014 hours. How large
a sample is needed if we want to be 95%
confident that the error in estimating the mean
life is less than 5 hours.
☐ E
A. 97
B. None of the other choices is correct
C. 98
D. 95
E. 96
Let Z0.025 1.96
FUO.sh
sh the exam.
