Z = (score-mean)/SD
Plug in the values to find Z. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion below that Z score.
Battery Power Problem. A certain type of thermal battery for an airplane navigation device backup power has a
mean life of 300 hours with a standard deviation of 15hours. What proportion of these batteries can be expected to have lives of 322 hours or less? Assume a normal
distribution of backup power device lives.
2 answers
7x+9y=518
0 answers