Trouble determining z-score. Given: sample mean = 56.7 , σ = 12.1, N = 500, and n = 47, find an 80% confidence to estimate Mu (the mean). I'm having trouble finding the z-score for an 80% confidence level.

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

If 24 people have the flu out of 360 people, how many would have the flu out of 900. choose many ways you could use proportion that david would use to solve this problem

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?