X is the weight of a baby when born (in gram). If the distribution of X is N(3315, 575) and Y is the number of babies with weight lower than 2719 in a random sample of 25, then P[Y≤4] is about...?
I'm trying to figure how to solve this. What kind of formula do I use? I suppose N is a normal distribution, that 3315 is the mean and that 575 the variance. Please correct me if I'm wrong.
Edit: As stated in the comments 575 should be the standard deviation. I'm not interested in the answer like someone suggested. If you teach me how should I approach this it is more than enough.