Answer:700 people entered the mall during that time.Step-by-step explanation:To find out how many people entered the mall during that time, we need to calculate the total count based on the information provided:The security guard marks his notebook every 100 people.He made 7 marks in the morning.To calculate the total number of people who entered the mall, we multiply the number of marks made by 100 (as each mark represents 100 people):Total number of people = Number of marks * 100Total number of people = 7 marks * 100Total number of people = 700