The mean useful life of car batteries is 47 months. They have a standard deviation of 2. Assume the useful life of batteries is normally distributed.

1. 
   Calculate the percent of batteries with a useful life of less than 43 months. (Round your answer to the nearest hundredth percent.)
   b. Calculate the percent of batteries that will last longer than 53 months.(Round your answer to the nearest hundredth percent.)
2. 
   Percent of batteries ____ %
3. Percent of batteries ____ %

IQ Scores IQ scores (as measured by the Stanford-Binet intelligence test) are normally distributed with a mean of 100 and a standard deviation of 16. What percentage of the population has an IQ score between 110 and 140? (Round your answer to the nearest percentage point).

IQ Scores IQ scores (as measured by the Stanford-Binet intelligence test) are normally distributed with a mean of 100 and a standard deviation of 16. What percentage of the population has an IQ score between 110 and 140? (Round your answer to the nearest percentage point).