1. For a typical 2-week (10-workday) period, daily demand in units is recorded as follows: 8 12 20 18 20 15 25 16 18 18 For the past 10 deliveries, the following pattern of lead times (i.e., performance cycle) in days is observed as follows: Lead Time (Days) Frequency 7 1 6 2 5 4 4 2 3 1 Total 10 What is the standard deviation of daily demand (keep two decimals)

2. For a typical 2-week (10-workday) period, daily demand in units is recorded as follows: 8 12 20 18 20 15 25 16 18 18 For the past 10 deliveries, the following pattern of lead times (i.e., performance cycle) in days is observed as follows: Lead Time (Days) Frequency 7 1 6 2 5 4 4 2 3 1 Total 10 Q8. What is the average lead time?

3. For a typical 2-week (10-workday) period, daily demand in units is recorded as follows: 8 12 20 18 20 15 25 16 18 18 For the past 10 deliveries, the following pattern of lead times (i.e., performance cycle) in days is observed as follows: Lead Time (Days) Frequency 7 1 6 2 5 4 4 2 3 1 Total 10 What is the standard deviation of lead times

4. Everbright, a light bulb firm, faces both uncertain demand and supply, which can be modeled by normal distributions. Answer the following questions. For a typical 2-week (10-workday) period, daily demand in units is recorded as follows: 8 12 20 18 20 15 25 16 18 18 For the past 10 deliveries, the following pattern of lead times (i.e., performance cycle) in days is observed as follows: Lead Time (Days) Frequency 7 1 6 2 5 4 4 2 3 1 Total 10 What is the level of combined uncertainty