The problem involves a binomial distribution with parameters:
- Number of trials, \(n = 250\)
- Probability of success, \(p = 0.65\)
We approximate the binomial distribution with a normal distribution using the following parameters:
- Mean, \(\mu = np = 250 \times 0.65 = 162.5\)
- Variance, \(\sigma^2 = np(1-p) = 250 \times 0.65 \times 0.35 = 56.875\)
- Standard deviation, \(\sigma = \sqrt{56.875}\)
We need to find \(P(X < 179)\). Using the continuity correction, we approximate this as \(P(X < 178.5)\).
Standardize the variable:
\(Z = \frac{178.5 - 162.5}{\sqrt{56.875}} = \frac{16}{\sqrt{56.875}} \approx 2.122\)
Using the standard normal distribution table, find \(P(Z < 2.122)\).
The probability is approximately \(0.983\).