☑Kizspy.me
(Choose 1 answer)
An electrical firm manufactures light bulbs that
☐ A
have a length of life that is approximately
normally distributed with a standard deviation of
40 hours. If a sample of 30 bulbs has an
average life of 780 hours, find a 96%
confidence interval for the population mean of
all bulbs produced by this firm.
☐ E
A. None of the other choices is correct
B. [765.795]
C. [665,955]
D. [865, 895]
E. [775. 785]
FUO.sh
the exam.
Let
Zoo=1.751 Zooz=2.054
10.02:29 2.15, 10.0429 = 1.814
