1. What is the required discrimination of a comparator given a tolerance of 0.005 and an accuracy ratio of 10:1? a. 0.0005 b. 0.005 c. 0.05 d. 0.5 2. A computer, in adding numbers, rounds each number off to the nearest integer. Suppose that all rounding errors are independent and uniformly distributed over(-0.5 , 0.5). If 1500 numbers are added, What is the probability that the magnitude of the total error exceed 15? a.0.1802 b.0.3132 c.0.0451 d.0.2842 3. 承第二題, Xi are independent random variables each having a uniformly distributed over(-0.5 , 0.5). How many nimbers may be added together in order that the magnitude of the total error is less than 10, with probability 0.9? a.187 b.94 c.374 d.444 4. In a study of television viewing habits among married couples, a researcher found that for a popular Saturday night program 25% of the husbands viewes the program regularly and 30% of the wives viewed the program regularly. The study found that for couples where the husband watches the program regularly 80% of the wives also watch regularly. What is the probability that at least one husband or wife watches the program regularly? a. 0.35 b. 0.2 c. 0.65 d. 0.4 四題選擇題 麻煩了～～ --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.113.160.27