# HW4 - Online EE 131A Homework#4 Due Oct 27th Read...

This preview shows pages 1–2. Sign up to view the full content.

Online EE 131A Homework #4 Fall 2010 Due Oct. 27th K. Yao Read Leon-Garcia (3rd edition), pp. 146-152; 163-180 1. An air defense system consists of n independent radar sets over a given area. Assume each radar has a probability of 0 . 9 of detecting an airplane. The system declares an airplane is present if one or more of the radar detects an airplane. Find the probability the system will declare an airplane if (a) n = 2, (b) n = 4. (Hint: Let X = number of radar sets out of n that detects an airplane. What is the distribution of X ?) (c) How large must n be in order for the system to declare an airplane with a 0 . 999 probability? 2. In 1985 the median income of a family in the U.S. was \$27 , 735 (i.e., one-half of the families has less than that income and one-half has more than that income). Among four randomly selected families, ﬁnd the probability that (a) all four had incomes above \$27 , 735, (b) one of the four had an income less than \$27 , 735. 3. Of all the toasters produced by a company, 60% are good, 30% are fair, 7% burn the

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

HW4 - Online EE 131A Homework#4 Due Oct 27th Read...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online