Video Transcript
The table shows the heights of 100 students in a school. How many students’ heights are greater than or equal to 120 centimeters?
The only group that represents students that have a height of less than 120 centimeters is the first group. This tells us that 12 students had a height of between 115 and 119 centimeters. As there were 100 students in total, we can subtract 12 from 100 to calculate the number of students whose heights are greater than or equal to 120 centimeters. 100 minus 12 is equal to 88. Therefore, 88 students had heights greater than or equal to 120 centimeters.
An alternative method would be to add the number of students in each of the other groups in the frequency table. All of these groups have students whose heights are greater than or equal to 120 centimeters. We can add 12, 20, 16, 12, 10, and 18. Adding these six numbers also gives us a total of 88.
We can therefore conclude that, of the 100 students in the school, 88 of them had heights greater than or equal to 120 centimeters.
