Suppose that 10% of all bits transmitted through a digital communication channel are erroneously received and that whether any particular bit is erroneously received is independent of whether any other bit is erroneously received. Consider sending a very large number of messages, each consisting of 20 bits. a. What proportion of these messages will have at most 2 erroneously received bits?

b. What proportion of these messages will have at least 5 erroneously received bits?

c. For what proportion of these messages will more than half the bits be erroneously received?

a) 0.677

b) 0.0431

c) 0

Step-by-step explanation:

For each bit, there are only two possible outcomes. Either it is correctly received, or it is erroneously received. Whether any particular bit is erroneously received is independent of whether any other bit is erroneously received. This means that we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

In which is the number of different combinations of x objects from a set of n elements, given by the following formula.

And p is the probability of X happening.

10% of all bits transmitted through a digital communication channel are erroneously

This means that

Messages of 20 bits:

This means that

a. What proportion of these messages will have at most 2 erroneously received bits?

This is . So

b. What proportion of these messages will have at least 5 erroneously received bits?

This is

In which

. So

Then

c. For what proportion of these messages will more than half the bits be erroneously received?

This is

If 11 is approximately 0, the rest(11, 12, 13,...) will also be approximately 0. So this proportion is 0.

domain is all the x values included in the

0 ≤ x ≤ 2

range is all the y values of the graph

-2 ≤ y ≤ 2

***keep in mind that there are different ways to show domain and range

hope this !

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