1. The problem statement, all variables and given/known data I've attached the question 2. Relevant equations Pr(X<=x)= (x + 0.5 - n*p) / sqrt(n*p*(1-p)) 3. The attempt at a solution okay so n=1150, p=0.02 , Pr(X<23) =23 + 0.5 - 1150(0.02) / sqrt(1150*0.02*0.98) =0.105316 is that bit right so far. Because it is less than i thought x might've been 22 instead of 23 so when i did that it equaled -0.105316 im not sure what do after that. Am i suppose to find that value in the normal distribution tables or something?