Convert all values either into months or years.
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores. To get percentages, multiply by 100.
c. Reverse process to find Z score and calculate.
can you show me the calculation ;)
The life expectancy of computer terminals is normally distributed with a mean of 4 years and standard deviation for 10 months.
a. What is the probability that a randomly selected terminal will last more than 5 years?
b. What percentage of terminals will last between 2.5 years and 4.5 years?
c. 80 percent of terminals will last at least how many years?
2 answers
0.102