If someone is born on the last day of a leap year does is mean they only have a birthday every 4 years?

The probability of being born on any given day of the year is 1/365 = p. The value of n = 89. The expected value, or mean = np = 89(1/365) = 0.244 students born on July 4th.

Common sense sort of tells you that yes, 2 would be unusually high (like 8 times more than expected!). But we can use the standard deviation to use math as well. The standard deviation =?(np(1-p)) =?(89(1/365)(364/365)) = .493 Therefore a score of 2 is (2-.244)/.493 = 3.56 standard deviations above the mean of .244.

As you know, ±3 standard deviations from the mean contains 99.7% of the data in a normal distribution, meaning +3.56 s.d. From the mean is literally off the charts.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.