OG数学练习有疑问 求好人指点！

小段巫婆

OG 的Data Analysis Exercise中
1）P298/16(b) 为什么16%后还要再减去0.01得到15%？ Give your answer to the nearest 0.05是什么意思？ 之前以为是保留到哪一位 做了才发现根本不用近似啊~
具体的问题为： If an adult penguin is chosen at random from the population, approximately what is the probability that the penguin’s height will be less than 60 centimeters? Give your answer to the nearest 0.05

2）P296/2 (b) 当中的standard deviation 难道不是直接用10.2*3 吗？我看到答案貌似自己重新算了呢？考试时也要这么精确吗？

先谢过各位大侠啦 好人一生平安 祝考试顺利 假期愉快！

竹林中人

1.最近的0.05，也就是说百分位是5.
2.题目能重复下吗？

小段巫婆

2. The numbers of passengers on 9 airline flights were 22, 33, 21, 28, 22, 31, 44,
50, and 19. The standard deviation of these 9 numbers is approximately
equal to 10.2.
(a) Find the mean, median, mode, range, and interquartile range of the 9
numbers.
(b) If each flight had had 3 times as many passengers, what would have been
the mean, median, mode, range, interquartile range, and standard
deviation of the nine numbers?
多谢啦~