1. Complete Activity 7.1 (Page 80). The following chart gives the average rate of growth in height of boys and girls with age. The figures in columns 2 and 3, give the percentage of the height a person has reached at the age given in column 1. For example, by the age 11, a boy has reached 81% of his probable full height, while a girl has reached 88% of her full height. These figures are only representative and there may be individual variations. Use the Table for your friends and work out how tall they are likely to be. Find out who is likely to be the tallest and who might be the shortest in your class.
| Age in Years | % of full height | |
| Boys | Girls | |
| 8 | 72% | 77% |
| 9 | 75% | 81% |
| 10 | 78% | 84% |
| 11 | 81% | 88% |
| 12 | 84% | 91% |
| 13 | 88% | 95% |
| 14 | 92% | 98% |
| 15 | 95% | 99% |
| 16 | 98% | 99.5% |
| 17 | 99% | 100% |
| 18 | 100% | 100% |
Calculation for full height (cm) = (Present Height)/(% of full height at this age) × 100
Example:
A boy is 9 years old and 120 cm tall. At the end of the growth period he is likely to be = (120/75) × 100 cm = 160 cm tall
Answer:
The table with the calculation of likely full heights of each of my classmates is shown below:
| Name | Age | Current Height (cm) | Approx Full Height (cm) |
| Sachin | 12 | 140 | 140/84 × 100 = 167 |
| Anisha | 13 | 150 | 150/95 × 100 = 158 |
| Ravi | 13 | 132 | 132/88 × 100 = 150 |
| Boojho | 12 | 138 | 138/84 × 100 = 164 |
| Paheli | 13 | 135 | 135/95 × 100 = 142 |
| Akash | 12 | 142 | 142/84 × 100 = 169 |
| Riya | 13 | 140 | 140/95 × 100 = 147 |
From the above table, we can see that Sachin is likely to the tallest and Paheli is likely to be shortest.
“The following chart gives the average rate of growth in height of boys and girls with age. The figures in columns 2 and 3, give the percentage of the height a person has reached at the age given in column 1. For example, by the age 11, a boy has reached 81% of his probable full height, while a girl has reached 88% of her full height. These figures are only representative and there may be individual variations. Use the Table for your friends and work out how tall they are likely to be. Find out who is likely to be the tallest and who might be the shortest in your class.” – Solved.
Related Links:
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Extended Learning Problem 3
Solution to Extended Learning Problem 4
Solution to Activity 7.1
Solution to Activity 7.2
Solution to Activity 7.3
Solution to Activity 7.4
Solution to Activity 7.5
Solution to Activity 7.6
Solution to Chapter 7 Reaching the Age of Adolescence
