A coin is tossed 80 times with following outcomes:

Head: 35 times and tail: 45 times.


In a single throw of a coin, if E be the event of getting a head, verify that p (E) +P(not E)=1.

Total number times a coin is tossed = 80


Number of times head occurred = 35


Number of times tail occurred = 45


Probability P() =


Probability of getting a head is P(head) =


Probability of getting a tails is P(tail) =


Here P(head) = and P(tail) =


Now, P(head) + P(tail)


Hence proved.


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