4. building's willis tower in chicago is i
1450 feet tall. the john hancock center
in chicago is 1127 feet tall. suppose you
are asked to build a small-scale replica of
each. if you make the willis tower
3 meters tall, what would be the
approximate height of the john hancock
replica? round your answer to the
nearest hundredth.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.