The lifetime of an electronic component is known to be normally distributed with a mean of 1000 h and a standard deviation of 80 h.
What is the probability that a component picked at random from the production line will have a lifetime
Between 1120 and 1180 h?
Between 955 and 975 h?
Below 955 h?
Above 975 h?
-Sketch the normal and the standard normal distribution for this problem and shade the area corresponding to part d.