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 height. The biggest cluster is 134cm/4'5" (7.4%).
Figure: Distribution of 9 Year-old Boys Height in Japan, 2015
| cm | feet | % |
| 113 | 3'8" | 0.01 |
| 114 | 3'9" | 0 |
| 115 | 3'9" | 0.01 |
| 116 | 3'10" | 0.06 |
| 117 | 3'10" | 0.10 |
| 118 | 3'10" | 0.10 |
| 119 | 3'11" | 0.21 |
| 120 | 3'11" | 0.37 |
| 121 | 4'0" | 0.48 |
| 122 | 4'0" | 0.90 |
| 123 | 4'0" | 1.21 |
| 124 | 4'1" | 1.83 |
| 125 | 4'1" | 2.15 |
| 126 | 4'2" | 2.92 |
| 127 | 4'2" | 3.83 |
| 128 | 4'2" | 4.60 |
| 129 | 4'3" | 5.08 |
| 130 | 4'3" | 6.13 |
| 131 | 4'3" | 6.77 |
| 132 | 4'4" | 6.80 |
| 133 | 4'4" | 7.39 |
| 134 | 4'5" | 7.40 |
| 135 | 4'5" | 6.65 |
| 136 | 4'5" | 6.38 |
| 137 | 4'6" | 5.94 |
| 138 | 4'6" | 4.92 |
| 139 | 4'7" | 4.04 |
| 140 | 4'7" | 3.34 |
| 141 | 4'7" | 2.48 |
| 142 | 4'8" | 2.23 |
| 143 | 4'8" | 1.54 |
| 144 | 4'9" | 1.25 |
| 145 | 4'9" | 0.94 |
| 146 | 4'9" | 0.56 |
| 147 | 4'10" | 0.33 |
| 148 | 4'10" | 0.33 |
| 149 | 4'11" | 0.20 |
| 150 | 4'11" | 0.18 |
| 151 | 4'11" | 0.13 |
| 152 | 4'12" | 0.04 |
| 153 | 5'0" | 0.05 |
| 154 | 5'1" | 0.04 |
| 155 | 5'1" | 0.01 |
| 156 | 5'1" | 0.01 |
| 157 | 5'2" | 0.01 |
| 158 | 5'2" | 0 |
| 159 | 5'3" | 0 |
| 160 | 5'3" | 0 |
| 161 | 5'3" | 0 |
| 162 | 5'4" | 0.01 |
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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