The mean life of a certain light bulb is 3 years with a standard deviation of 0.5 years ...

3) The mean life of a certain light bulb is 3 years with a standard deviation of 0.5 years. if this set of data fits a normal distribution, what is the probability that your bulb will last between 2.5 and 4.0 years. explain your answer in words as well as stating the probability, and draw a picture of the appropriate normal curve. Mark the mean and each standard deviation away from the mean