Answer: -0.81
Explanation:
A standard normal random variable simply refers to the normally distributed random variable which has a imean of 0 and also had a standard deviation that has the value of 1.
The standard normal variable can also be represented by the letter Z. For some value of Z, the probability that a standard normal variable is below Z is 0.2090. The value of Z is -0.81.
Because the USA and other countries fear nuclear threats and are afraid they will bomb their country. This would result in war and use of more nuclear weapons which would kill many.
The average time would prob. be 6:00
