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 6 year-old boys height. The biggest cluster is 116cm/3'10" (8.46%).
Figure: Distribution of 6 Year-old Boys Height in Japan, 2015
| cm | feet | % |
| 98 | 3'2" | 0.01 |
| 99 | 3'3" | 0.01 |
| 100 | 3'3" | 0.01 |
| 101 | 3'4" | 0.04 |
| 102 | 3'4" | 0.06 |
| 103 | 3'4" | 0.10 |
| 104 | 3'5" | 0.34 |
| 105 | 3'5" | 0.37 |
| 106 | 3'6" | 0.69 |
| 107 | 3'6" | 1.22 |
| 108 | 3'6" | 1.82 |
| 109 | 3'7" | 2.57 |
| 110 | 3'7" | 3.29 |
| 111 | 3'8" | 4.35 |
| 112 | 3'8" | 5.45 |
| 113 | 3'8" | 7.01 |
| 114 | 3'9" | 7.36 |
| 115 | 3'9" | 7.82 |
| 116 | 3'10" | 8.46 |
| 117 | 3'10" | 8.02 |
| 118 | 3'10" | 7.90 |
| 119 | 3'11" | 6.40 |
| 120 | 3'11" | 6.34 |
| 121 | 4'0" | 5.14 |
| 122 | 4'0" | 4.15 |
| 123 | 4'0" | 3.33 |
| 124 | 4'1" | 2.58 |
| 125 | 4'1" | 1.74 |
| 126 | 4'2" | 1.26 |
| 127 | 4'2" | 0.81 |
| 128 | 4'2" | 0.43 |
| 129 | 4'3" | 0.41 |
| 130 | 4'3" | 0.18 |
| 131 | 4'3" | 0.16 |
| 132 | 4'4" | 0.05 |
| 133 | 4'4" | 0.08 |
| 134 | 4'5" | 0.03 |
| 135 | 4'5" | 0.01 |
| 136 | 4'5" | 0 |
| 137 | 4'6" | 0.01 |
| 138 | 4'6" | 0 |
| 139 | 4'7" | 0 |
| 140 | 4'7" | 0 |
| 141 | 4'7" | 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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