Please answer a-c. Thanks 2.Underwater acoustic communication. A subcarrier is onetelecommunication signal carrier that is carried on top ofanother carrier so that effectively two signals are carried atthe same time. Subcarriers can be used for an entirely dif-ferent purpose than main carriers. For example, data sub-carriers are used for data transmissions; pilot subcarriersare used for channel estimation and synchronization; and,null subcarriers are used for direct current and guardbanks transmitting no signal. In the IEEE Journal ofOceanic Engineering (April, 2013), researchers studiedthe characteristics of subcarriers for underwater acousticcommunications. Based on an experiment conducted offthe coast of Martha's Vineyard (MA), they estimated that25% of subcarriers are pilot subcarriers, 10% are null sub-carriers, and 65% are data subcarriers. Consider a sampleof 50 subcarriers transmitted for underwater acoustic com-munications.a. How many of the 50 subcarriers do you expect to bepilot subcarriers? Null subcarriers? Data subcarriers?b. How likely is it to observe 10 pilot subcarriers, 10 nullsubcarriers, and 30 data subcarriers?c. If you observe more than 25 pilot subcarriers, whatwould you conclude? Explain.

From the given information, The percentage of subcarriers are pilot subcarriers is 25%. The…

Underwater acoustic communication. A subcarrier is one telecommunication signal carrier that is carried on top of another carrier so that effectively two signals are carried at the same time. Subcarriers can be used for an entirely dif- ferent purpose than main carriers. For example, data sub- carriers are used for data transmissions; pilot subcarriers are used for channel estimation and synchronization; and,