Question

A coin is weighted so that there is a 74% chance that it will come up "heads" when flipped. The coin is flipped four times. Find the probability of at least one of the flips resulting in "tails". Round your answer to four decimal places.

Answer 1

Now, you can deduce from question that the probability of have "heads" is 74% or the same

$\frac{74}{100}$

If you flipp the coin four times, for each time you need to multiply one fraction like the up... it will be:

$\text{probability 4 times = }\frac{74}{100}\cdot\frac{74}{100}\cdot\frac{74}{100}\cdot\frac{74}{100}=\frac{29.986.576}{100.000.000}=0.29986576$

Finally, your answer round to four decimal points will be: 0.2999 because the last 8 will be 9, for the reason that the next number (6) is bigger that 5.