Final answer:
To find the probability that the mean germination time of a sample of 160 seeds will be within 0.5 days of the population mean, we can use the Central Limit Theorem. The probability is 1.9954.
Step-by-step explanation:
To find the probability that the mean germination time of a sample of 160 seeds will be within 0.5 days of the population mean, we can use the Central Limit Theorem. According to the theorem, as the sample size increases, the distribution of the sample mean approaches a normal distribution. In this case, the population mean is 22 days and the standard deviation is 2.3 days.
We can calculate the standard deviation of the sample mean by dividing the population standard deviation by the square root of the sample size. So, the standard deviation of the sample mean is 2.3 / √160 = 0.182.
Next, we need to find the z-scores for the lower and upper limits of the desired range. The z-score for 0.5 days below the population mean can be calculated as (mean - lower limit) / standard deviation = (22 - 21.5) / 0.182 = 2.75.
Similarly, the z-score for 0.5 days above the population mean is (upper limit - mean) / standard deviation = (22.5 - 22) / 0.182 = 2.75.
Using a standard normal distribution table, the probability associated with a z-score of 2.75 is approximately 0.9977.
Since the distribution is symmetric, the probability of the sample mean being within 0.5 days of the population mean is twice this value, i.e., 2 x 0.9977 = 1.9954, or approximately 1.9954.
Therefore, the probability that the mean germination time of a sample of 160 seeds will be within 0.5 days of the population mean is 1.9954.