The lives of refrigerators are normally distributed with yea

The lives of refrigerators are normally distributed with years and a standard deviation years. Draw a normal curve with the parameters labeled.

Solution

you can draw the normal curve

b) the region will be the right tail

c) there are 11.51% that have a value of 17 or more

d)

P( z < 12 - 14 / 2.5 )

p( z <-0.8) = 0.2119

e)

P( z > 15 - 14 /2.5)

P( z >0.4) = 0.3446