Use the normal approximation to the binomial to find the probability for \( n=50, p=0.6 \), and \( X=33 \). Use The Standard Normal Distribution Table. Round \( z \) - value calculations to 2 decimal places and final answer to 4 decimal places. The probability is
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To find the probability for \( n=50 \), \( p=0.6 \), and \( X=33 \) using the normal approximation to the binomial distribution, we first calculate the mean (\( \mu \)) and the standard deviation (\( \sigma \)) of the binomial distribution. 1. **Calculate the mean and standard deviation**: \[ \mu = n \cdot p = 50 \cdot 0.6 = 30 \] \[ \sigma = \sqrt{n \cdot p \cdot (1 - p)} = \sqrt{50 \cdot 0.6 \cdot 0.4} \approx 3.464 \] 2. **Convert \( X=33 \) to a z-score**: Using the continuity correction, we consider \( X=32.5 \): \[ z = \frac{X - \mu}{\sigma} = \frac{32.5 - 30}{3.464} \approx 0.72 \] 3. **Look up the z-score in the standard normal distribution table** for \( z=0.72\): The value from the table is approximately \( 0.7642 \). This is the probability of getting \( X \leq 32.5 \). 4. **To find \( P(X \geq 33) \)**, we can calculate: \[ P(X \geq 33) = 1 - P(X \leq 32.5) = 1 - 0.7642 = 0.2358 \] Hence, the probability for \( n=50 \), \( p=0.6 \), and \( X=33 \) is approximately **0.2358** when rounded to four decimal places.
