Winners Club
   Winners Club is a bank account (账户) specially for teenagers. It has been sep up to help you better manage your money. The club is a bank account where you receive a key-card, so you can enjoy dealing with your money 24/7 — that's 24 hours a day, 7 days a week!
Here are the features (特点) of the club.
                                                     No account keeping fees (费用)!
   You're not a rich man, so we don't expect you to pay large fees. In fact, it's free for all the service!
                                                     Excellent interest rates (利率)!
   You want your money to grow, right? If you put money into the club without taking it out for a year, the club will give you a good rate of interest.
                                                             Convenient (方便)！
   Teenagers are busy — we get that. You may never need to come to a bank at all. With the club you can choose to use handy tellers and to bank from home using the phone and the Internet. This could be your pocket money or your pay from your part-time job!
                                                   A free magazine included！
   Besides your account report, you will receive a free magazine full of good ideas about making more money. There are also other fantastic offers only for the club members.
                                                         Easy to be a member！
   It is so easy to join. Simply fill in an application form (申请表). By the way, one of your parents must agree on it. Then you can become a member of the club.
   Now you see the club is a great choice for teenagers. We can't wait to have you as a Winners Club member.

人民币汇率中间价变化表

人民币汇率的这种变化可能带来的影响是（   ）

①有利于中国企业扩大对外投资        ②增加我国产品出口

③赴美国留学费用增加                ④有利于中国进口外国商品

（Ⅰ）地产数据研究院研究发现，3月至7月的各月均价y（万元/平方米）与月份x之间具有较强的线性相关关系，试建立y关于x的回归方程（系数精确到0.01），政府若不调控，依次相关关系预测第12月份该市新建住宅销售均价；

（Ⅱ）地产数据研究院在2016年的12个月份中，随机抽取三个月份的数据作样本分析，若关注所抽三个月份的所属季度，记不同季度的个数为X，求X的分布列和数学期望．

参考数据： ${\displaystyle \sum _{i=1}^5{x}_i}$ =25， ${\displaystyle \sum _{i=1}^5{y}_i}$ =5.36， ${\displaystyle \sum _{i=1}^5(x_i-\overline{x})(y_i-\overline{y})}$ =0.64

回归方程 $\widehat{y}=\widehat{b}x+\widehat{a}$ 中斜率和截距的最小二乘估计公式分别为：

$\widehat{b}$ = $\frac{{\displaystyle \sum _{i=1}^5(x_i-\overline{x})(y_i-\overline{y})}}{{\displaystyle \sum _{i=1}^n{(x_i-\overline{x})}^2}}$ ， $\widehat{a}=\overline{y}-\widehat{b}\overline{x}$ ．

下列成语运用正确的一项是（    ）