Flight 202's arrival time is normally distributed with a mean arrival time of 10:30 p.m. and a standard deviation of 15 minutes.
Use the eight-part symmetry of the area under a normal curve to find the probability that a randomly chosen arrival time is between 10:00 p.m. and 11:00 p.m. The probability is__
The score of Z =-2 means that 10:00 p.m. is -2 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the condition of 2 deviations from the mean has percentage of 2.35%
and
The score of Z =2 means that 11:00 p.m. is 2 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the condition of 2 deviations from the mean has percentage of 2.35%