Use the normal approximation to find the probability that the results lie between 96 and 106 people

Question:

Use the normal approximation to find the probability that the results lie between 96 and 106 people (inclusive).
Figure 6 in Section 6.1, as part of Example 5, illustrating stochastic immigration, was generated by adding two individuals with probability 0.5 and zero with probability 0.5 for 100 generations. The results in the figure show final populations of 106 and 96 people.