围绕“宪法与国家生活、公民生活的关系”同学们展开热议，纷纷表达各自的观点。请你对他们的观点甲乙辨析。

A: How was your day off, Tina?
B: Oh, it was awful.
A: Really?  1
B: Well, we wanted to go camping, but the weather was terrible.  2
A: Oh, that's too bad. Then what did you do? Did you watch TV at home?
B: No.  3   . It was boring.
A: Sounds terrible, Tina.
B:   4
A: I think I had great fun. I went to the museum and met a famous actor.  5      And I got his autograph.
B: That sounds wonderful.

人生就像穿衣服，扣扣子，如果第一粒扣子扣错了，剩余的扣子都会错。这启示我们（  ）

样本方差的计算式中S²= $\frac{1}{90}$ （x₁﹣30）²+（x₂﹣30）²+…+（x_n﹣30）²中，数30表示样本的____．