# 8.3.1. Collecting and Organizing Data

The table below shows the heights of 40 students in centimetres. Form a frequency table using the sets 130–, 140–, 150–, 160–, and 170–, and then find the number of students whose heights are less than cm.

 143 148 148 155 154 148 171 135 174 153 153 135 162 172 143 142 147 150 134 175 158 173 173 156 171 175 134 172 157 154 174 146 151 146 174 137 176 149 152 136
• A27 students
• B28 students
• C21 students
• D11 students

### Example

The table below shows the heights of 40 students in centimetres. Form a frequency table using the sets 130–, 140–, 150–, 160–, and 170–, and then find the number of students whose heights are less than cm.

 143 148 148 155 154 148 171 135 174 153 153 135 162 172 143 142 147 150 134 175 158 173 173 156 171 175 134 172 157 154 174 146 151 146 174 137 176 149 152 136

### Solution

Form a frequency table.

 Sets Frequency Total 6 10 11 1 12 40

The number of students whose heights are less than is equal to the sum of the frequencies for the sets , , and .

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