Multiply the number of attempts with the probability,
160 x 0.8 = 128 attempts made.
Hope this helps.
For this case we must indicate the correct sign between the following numbers:

We have to:

So, we have to 
Answer:

That’s the answer and i showed the work hoped this helped!!!
0.015 or 3/200
15 divided by 1000 is 0.015
15/5 is 3 1000/5 is 200