please answer question 4

please answer number 4

E chalal Aw oled al deta Rre ifmoun 4. Figure 7.EX1 is a level 1 data flow diagram of data movement in a Niagara Falls tour agency called Marilyn's Tours. Read it over, checking for any inaccuracies. a. List and number the errors that you have found in the diagram. b. Redraw and label the daata flow diagram of Marilyn's so that it is correct. Be sure that your new diagram employs symbols properly so as to cut down on reperitions and duplications where possible. 5. Perfect Pizza wants to install a system to record orders for pizza and chicken wings. When regular customers call Perfect Pizza on the phone, they are asked their phone number. When the number is typed into a computer, the name, address, and last order date is automatically brought up on the sereen. Once the order is taken, the total, including tax and delivery, is calculated. Then the order is given to the cook. A receipt is printed. Occasionally, special offers (coupons) are printed so the customer can get a discount. Drivers who make deliveries give customers a copy of the receipt and a coupon (if any). Weekly totals are kept for comparison with last year's performance. Write a summary of business activities for taking an order at Perfect Pizza. 6. Draw a context-level data flow diagram for Perfect Pizza (Problem 5). 7. Explode the context-level diagram in Problem 6 showing all the major processes. Call this Diagram 0. It should be a logical data flow diagram. FIGURE 7.EX1 A hand-sketched data flow diagram for Marilyn's Tours