Sandra runs a charitable organization for cancer patients. She organizes an event every 6 months to thank all the contributors and share the plan for the next 6 months. For every event, she sends invitations to all the contributors. However, all of the invitees do not turn up for the event. To make the necessary arrangements, she analyzes the data for the last 5 events. The table below compares the number of invitations sent and the number of people who attended the event. If Sandra has to send 900 invitations this year, how many people should she expect? Invitations 500 600 400 500 700 Attendance 450 540 360 450 630 a. 630 c. 830 b. 810 d. 900