[計量] 不好意思想問一題數學

[elyshih85 (w._.ei)]

各位好，想請問這題大家都怎麼想的呢?

In a survey, 130 people were asked how many movies they had seen in the
preceding year. Their responses varied from 0 to 30 movies. The graphs above
show two different summaries of the samesurvey results. How many people
responded that they had seen 11 or 12 movies?
https://i.imgur.com/7KCE6jg.jpg



A.10  B.12  C.15  D.20  E.23





此題答案是給E，請問是為什麼呢?(˙A˙);

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推 ocf001497   : 為啥不是A OTZ
→ elyshih85   : 我也不懂哈哈哈哈 有沒有人可以說明呢~
→ JinCheng5566: 不是A嗎 QQ
推 ksyilj1283  : 我也是算A...
→ yh41        : 你的答案有問題，我估狗到一樣的題目，答案是A啦
→ yh41        : https://goo.gl/dobtm3  要對自己有信心啦！XD
→ iwill0202   : 請問大大們是用扣的算出來的嗎？
→ elyshih85   : 真的嗎? 謝謝啦原來答案有問題，因為我怎麼找也沒有
→ elyshih85   : 我是用估的 請問大家是怎麼求出A的呢? XD
推 yogurt1988  : 下圖的30+35 減去 上圖的25+30 = 10
→ elyshih85   : @iwi110202 真的太感恩了!!!! 沒想到哈哈~~