1.常见传动系统的传动比:圆柱齿轮=5,锥齿轮=3,链=8,带=6,1平带=3 蜗杆:5≤i≤100,15≤i≤50 2.手表30°=720{17 360°×60 大d=17×720×3mm=36.72m一对齿轮

1 What Is Statistics? 1 2 Probability 20 3 Discrete Random Variables and Their Probability Distributions 86 4 Continuous Variables and Their Probability Distributions 157 5 Multivariate Probability Distributions 223 6 Functions of Random Variables 296 7 Sampling Distributions and the Central Limit Theorem 346 8 Estimation 390 9 Properties of Point Estimators and Methods of Estimation 444 10 Hypothesis Testing 488 11 Linear Models and Estimation by Least Squares 563 12 Considerations in Designing Experiments 640 13 The Analysis of Variance 661 14 Analysis of Categorical Data 713 15 Nonparametric Statistics 741 16 Introduction to Bayesian Methods for Inference 796

An explorer is trying to reach the Holy Grail, which she believes is located in a desert shrine d days walk from the nearest oasis. In the desert heat, the explorer must drink continuously. She can carry at most 1 gallon of water, which is enough for 1 day. However, she is free to create water caches out in the desert. For example, if the shrine were 2/3 of day's walk into the desert, then she could recover

第一章: 选择题: 1、A2.a3.c4.a5.b6.A 第二章: 选择题: 1B2.C3.A(不确定)4.B 第三章: 1.c2.b3.d4.c5.b6.b