1. Data collected over a long period of time showed that a particular genetic defect occurs in 2 of every 1000 children. Let X be the random variable “number of children with genetic defect in a sample of 20,000 children examined”. The records of a medical clinic show X = 25 children.

a) What is the probability of observing a value X of 25 or less?

b) Would you say that the observation of X = 25 children with genetic defect was rather unlikely?

please help it will be on test.