9
From the following data relating to weights of 30 students in kg 138,
164, 150, 131, 144, 125, 149, 157, 146, 148, 144, 168, 126, 138, 176, 163,
119, 150, 165, 146, 142, 135, 140, 135, 161, 145, 150, 156, 145, 128.
Obtain the range of weights of the students.
Write appropriate number of class intervals and obtain the
frequency distribution.
Find the number of students whose weight is
Less than 145kg
More than 155kg III Between 135 and 155 kg.
Dear student
Arranging weights in ascending order: 119, 125, 126, 128, 131, 135, 135, 138, 138, 140, 142, 144, 144, 145, 145, 146, 146, 148, 149, 150, 150, 150, 156, 157, 161, 163, 164, 165, 168, 176
Range = Highest Value - Lowest
R = 176 - 119 = 57
Students weighting less than 145 = 13
Students weighting more than 155 = 8
Students weighting between 135 and 155= 15
Regards
Arranging weights in ascending order: 119, 125, 126, 128, 131, 135, 135, 138, 138, 140, 142, 144, 144, 145, 145, 146, 146, 148, 149, 150, 150, 150, 156, 157, 161, 163, 164, 165, 168, 176
Range = Highest Value - Lowest
R = 176 - 119 = 57
| Class Interval | Weights (frequency) |
| 100 - 115 | 0 |
| 115-130 | 4 |
| 130-145 | 9 |
| 145-160 | 11 |
| 160-175 | 5 |
| 175-190 | 1 |
| Total | 30 |
Students weighting less than 145 = 13
Students weighting more than 155 = 8
Students weighting between 135 and 155= 15
Regards