The average credit card debt for college seniors is $3262. If thedebt is normally distributed with a standard deviation of $1100,find these probabilities.
a) That the senior owes at least $1000
b) That the senior owes more than $4000
c) That the senior owes between $3000 and$4000
The average waiting time to be seated for dinner at a popularrestaurant is 23.5 minutes, with a standard deviation of 3.6minutes. Assume the variable is normally distributed. When a patronarrives at the restaurant for dinner, find the probability that thepatron will have to wait the following time.
a) Between 15 and 22 minutes
b) Less than 18 minutes or more than 25 minutes
c) Is it likely that a person will be seated in lessthan 15 minutes?
The average price of a personal computer (PC) is $949. If thecomputer prices are approximately normally distributed andσ=100, what is the probability that a randomly selected PC costs more than $1200? The least expensive 10% of personal computers cost less than what amount?