Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.64 and standard deviation 0.89. (a) If a random sample of 25 specimens is selected, what is the probability that the sample average sediment density is at most 3.00? Between 2.64 and 3.00? (Round your answers to four decimal places.) at most 3.00 between 2.64 and 3.00 (b) How large a sample size would be required to ensure that the first probability in part (a) is at least 0.99? (Round your answer up to the nearest whole number.) specimens
Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.64 and standard deviation 0.89. (a) If a random sample of 25 specimens is selected, what is the probability that the sample average sediment density is at most 3.00? Between 2.64 and 3.00? (Round your answers to four decimal places.) at most 3.00 between 2.64 and 3.00 (b) How large a sample size would be required to ensure that the first probability in part (a) is at least 0.99? (Round your answer up to the nearest whole number.) specimens
Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.64 and standard deviation 0.89. (a) If a random sample of 25 specimens is selected, what is the probability that the sample average sediment density is at most 3.00? Between 2.64 and 3.00? (Round your answers to four decimal places.) at most 3.00 between 2.64 and 3.00 (b) How large a sample size would be required to ensure that the first probability in part (a) is at least 0.99? (Round your answer up to the nearest whole number.) specimens
Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.64 and standard deviation 0.89.
(a) If a random sample of 25 specimens is selected, what is the probability that the sample average sediment density is at most 3.00? Between 2.64 and 3.00? (Round your answers to four decimal places.)
at most 3.00
between 2.64 and 3.00
(b) How large a sample size would be required to ensure that the first probability in part (a) is at least 0.99? (Round your answer up to the nearest whole number.) specimens
Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.
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