1) The average (mean) toll for telephone calls to South America is $85; the standard deviation is $10. Assuming that the tolls are normally distributed, 1. a) between what two values symmetrically distributed 99% of calls fall? 2. b) what is the toll (in dollars and cents) that is exceeded by 98% of the callers? 3. c) with 99% confidence, what should the sample size be if sampling error is within +_2?