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～～
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