Question
The lifetime of a SuperTough AAA battery is normally distributed with mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be 25 hours or less?
a. 0.7454
b. 0.6604
c. 0.2546
d. 0.3396
a. 0.7454
b. 0.6604
c. 0.2546
d. 0.3396
Answers
bobpursley
http://davidmlane.com/hyperstat/z_table.html
answer c. check it with the applet.
answer c. check it with the applet.