Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Bajrang
plz follow the data communications and networking 5th edition by forouzan page 80 here explain SNR and page 83 example 3.37 , example 3.40 in your question only formulas r applied . i m also attach this pages so plz read. agar phir bhi doubt reh jaye to reply krna