2 times, you can fold it without no overlapping on any line
110 girls and 85 boys.
Subtract 1 from 195. Then divide by 2. 194/2 = 97. Then add 13 97+13=110. There are 110 girls.
Easy! 1 hour - 1 hour and 30 minutes = 30 minutes(together)
Well you did not say how many miles you are from Michigan
The mean of the probability distribution is given by the expected value given by

The variance of the probability distribution is given by

The standard deviation is given by