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一个布袋中装有只有颜色不同的a(a>12)个小球,分别是2个白球、4个黑球,6个红球和b个黄球,从中任意摸出一个球,记下颜色后放回,经过多次重复实验,把摸出白球,黑球,红球的概率绘制成统计图(未绘制完整).根据题中给出的信息,布袋中黄球的个数为  ____

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    For fans of Emma Watson, it's quite exciting that she perfectly plays the role of Belle in Disney's fantasy film Beauty and the Beast. In most fairy tales, it's the woman who 1her prince to rescue her from danger, but in this movie, Belle, independent and active, with 2and kindness, saves her love and 3him from a fearsome beast back into a charming prince.

    Watson, in real life, is 4 with her famous roles. She is 5 for fighting for equality for women all over the world and is always proud of her feminist(女权主义)thoughts. Actually, her early 6 affected her decision to be so strong in her.7. She claimed in one speech she 8 on gender(性别)equality: At age 8, she was called “bossy” by boys only because she, a girl, wanted to direct plays. She then started to focus on gender equality. Afterward, her enthusiastic and wise public speeches have 9 many miserable women, for which she 10 credit.

    On March 8, Watson 11 a live Question and Answer about gender equality for the UN's HeForShe campaign. During the12, Watson emphasized that gender equality doesn't just 13 women. “I've got four brothers. Gender equality is having an effect on them just as 14 as me. My brother once said he just couldn't 15 some of his male friends, 16the rude way they talk about girls.”

    When Watson was17as a UN Women Goodwill Ambassador, UN Secretary-General Ban Ki-moon joked that he hoped Watson used her magic stick to 18 violence against women. And the19 young woman is doing and will 20to do so.