1. The lengths of time bank customers must wait for a teller are normally distributed, with a mean of 3 minutes and a standard deviation of 1.5 minute.
a. What proportion of bank customers waits between 2 and 4 minutes.
b. What percentage wait more than 3.5 minutes?
c. What proportion waits between 2.0 and 3.5 minutes?
d. What percentage wait less than 2 minute?
2. The area under the standard normal distribution between -2.0 and 2.0 is
a 0.1338
b 0.1668
c. 0.4332
d. None of the above
3. Use the data in the chart below to solve your quiz answers.
Quiz 1
Mean - 70.3
s - 12.85
***** my quiz 1 score was 96% or 48 out of 50
1 What was your score on Quiz 1? If it was 100, replace it with an 85.
2. Convert your Quiz 1 score to a z-score. List your z-score.
3. What percentage of the class did better than you?