<h2>
Answer:</h2>
The probability of failure is:
0.5
<h2>
Step-by-step explanation:</h2>
It is given that:
Janie flips a coin 70 times and records if it comes up heads.
Also, getting of a head is considered as a success.
This means that getting a tail will be a failure for the experiment.
As we know that for a unbiased coin the probability of getting a tail; and a head are equal.
Hence, the probability of head is: 1/2=0.5
and probability of tail is: 1/2=0.5
Hence, the probability of a failure is: 0.5
