In every April, students are measured their heights and weights at school. The government collects those data and publishes them each year. Here are the 2015 data on the distribution of 9 year-old boys' weights.
Figure: Distribution of 9 Year-old Boys' Weights in Japan, 2015


| kg | lb | % |
| 15 | 33 | 0.0 |
| 16 | 35 | 0.0 |
| 17 | 37 | 0.0 |
| 18 | 40 | 0.0 |
| 19 | 42 | 0.1 |
| 20 | 44 | 0.4 |
| 21 | 46 | 0.8 |
| 22 | 49 | 1.8 |
| 23 | 51 | 3.3 |
| 24 | 53 | 5.0 |
| 25 | 55 | 6.9 |
| 26 | 57 | 8.1 |
| 27 | 60 | 9.1 |
| 28 | 62 | 8.8 |
| 29 | 64 | 8.5 |
| 30 | 66 | 8.0 |
| 31 | 68 | 6.4 |
| 32 | 71 | 5.6 |
| 33 | 73 | 4.9 |
| 34 | 75 | 3.6 |
| 35 | 77 | 3.1 |
| 36 | 79 | 2.5 |
| 37 | 82 | 2.1 |
| 38 | 84 | 1.8 |
| 39 | 86 | 1.3 |
| 40 | 88 | 1.5 |
| 41 | 90 | 1.0 |
| 42 | 93 | 0.9 |
| 43 | 95 | 0.8 |
| 44 | 97 | 0.6 |
| 45 | 99 | 0.5 |
| 46 | 101 | 0.5 |
| 47 | 104 | 0.4 |
| 48 | 106 | 0.3 |
| 49 | 108 | 0.3 |
| 50 | 110 | 0.2 |
| 51 | 112 | 0.2 |
| 52 | 115 | 0.2 |
| 53 | 117 | 0.1 |
| 54 | 119 | 0.1 |
| 55 | 121 | 0.2 |
| 56 | 123 | 0.1 |
| 57 | 126 | 0.1 |
| 58 | 128 | 0.1 |
| 59 | 130 | 0.0 |
| 60 | 132 | 0.0 |
| 61 | 134 | 0.0 |
| 62 | 137 | 0.0 |
| 63 | 139 | 0.0 |
| 64 | 141 | 0.0 |
| 65 | 143 | 0.0 |
| 66 | 146 | 0.0 |
| 67 | 148 | 0.0 |
| 68 | 150 | 0.0 |
| 69 | 152 | 0.0 |
| 70 | 154 | 0.0 |
| 71 | 157 | 0.0 |
| 72 | 159 | 0.0 |
| 73 | 161 | 0.0 |
| 74 | 163 | 0.0 |
| 75 | 165 | 0.0 |
| 76 | 168 | 0.0 |
| 77 | 170 | 0.0 |
| 78 | 172 | 0.0 |
| 79 | 174 | 0.0 |
| 80 | 176 | 0.0 |
| 81 | 179 | 0.0 |
| 82 | 181 | 0.0 |
| 83 | 183 | 0.0 |
Source is Ministry of Education, Culture, Sports, Science and Technology.
www.mext.go.jp/b_menu/toukei/chousa05/hoken/kekka/k_detail/1365985.htm
www.e-stat.go.jp/SG1/estat/Xlsdl.do?sinfid=000031399258
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