[計量] 問兩個題目
1.
表：Citizenship status reported
Total
1990 19,767,316
1970 9,739,723
問題：What was the percent increase in population
from 1970 to 1990？ Round your answer to
the nearest whole number.
解答：First find the difference between the population
in 1990 and the population in 1970.
19,767,316 - 9,739,723 = 10,027,596
Next, divide the difference by the population in 1990.
10,027,596 / 19,767,316 = 0.507, which rounded to 51%.
第一題想請問為什麼是除以1990的數量，而不是除以1970呢？
2.
The variable x is normally distributed. The values of x at
45th, the 15th, and the kth percentile of the distribution are
550, 350, and 450, respectively.
Quantiny A Quantiny B
k 30
Ans : B 大
第二題我猜是一個高斯分布圖，不過如何對應上述的量值不太明白，
因此想詢問如何解題，感謝。
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