5). Everyone in Sanjay's class has the same laptop. After fully charging their laptons.
records how many hours each laptop lasts before it needs the next charge. The class data was
recorded and graphed as shown at right. The data has a mean of 5.9 hours with a standard
deviation of 1.6.
a. Is a normal distribution an appropriate model for how
long a laptop lasts before needing a charge?
b. Assume that these laptops represent all the laptops at
the school. What is the chance that a randomly selected
laptop will last for the full school day of 7 hours?
1
2
9 10
3 4 5 6 7 8
battery life (hours)
c. In what percentile is a laptop that lasts less than 5 hours?