Height of cms | Number of boys |
95-105 | 9 |
105-115 | 13 |
115-125 | 26 |
125-135 | 30 |
135-145 | 12 |
145-155 | 10 |
Height of cms | Number of boysfi | mid-point Xi | fi×Xi | ∣xi−¯x∣ | fi∣xi−¯x∣ |
95-105 | 9 | 100 | 900 | 25.3 | 227.7 |
105-115 | 13 | 110 | 1430 | 14.3 | 198.9 |
115-125 | 26 | 120 | 3120 | 5.3 | 137.8 |
125-135 | 30 | 130 | 3900 | 4.7 | 141 |
135-145 | 12 | 140 | 1680 | 14.7 | 176.4 |
145-155 | 10 | 150 | 1500 | 24.7 | 247 |