SHOW COMPLETE SOLUTION: 1. For a normal distribution, the area to the left of - 1.5 is a. 0. 8531 b. 0. 3531 c. 0. 6469 d. 0. 7648 2. The area under the normal curve between - 3.5 and +1.0 is a. 0.4989 b. 0.1576 c. 0.3413 d. 0.5654 3. A shop found out that it takes 40 minutes on average for a specific task to be completed. Given that the standard deviation for this task is 5 minutes and the task are normally distributed, what is the probability that on any given day it will take 50 minutes or more to complete the task? a. 0.7228 b. 0.0228 c. 0.4772 d. 0.5000 4. A manufacturer of light bulbs guarantee that his bulbs will last an average of 10,000 hours. Test have shown that the bulbs last an average of 12,000 hours with a standard deviation of 500 hours. Assuming a normal distribution, what is the likelihood that the bulbs will not last more that 10,000 hours?