Use the Normal Approximation to Find the Indicated Probability $p$ , And

Multiple Choice

Use the normal approximation to find the indicated probability. The sample size is population proportion of successes is $p$ , and $X$ is the number of successes in the sample.
$$n = 77 , p = 0.33 : P ( X \leq 18 )$$

A) 0.0418
B) 0.0475
C) 0.9525
D) 0.0582