find the numbers

Question

1.The probability of getting 8 or more tails from 10 flips of an unfair coin that is biased to land on heads 60% of the time.

2.The standard deviation of the number of dart throws I have to make until I get a bulls-eye (assuming my chances of making a bulls-eye on any throw is 0.739).

3.The probability that a randomly chosen person has an IQ over 120 (IQ scores are normally distributed with a mean of 100 and standard deviation of 15).

Answer 1

1) .4^8=.000655

2) Use calculator to find s=.745

3) Use calculater to find P=.0912