Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.7 and standard deviation 0.94. USE SALT (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 2.7 and 3.00? (Round your answers to four decimal places.) at most 3.00 between 2.7 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 You may need to use the appropriate table in the Appendix of Tables to answer this question.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
Question
Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.7 and standard deviation 0.94.
USE SALT
(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 2.7 and 3.00? (Round your answers to four decimal places.)
at most 3.00
between 2.7 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
You may need to use the appropriate table in the Appendix of Tables to answer this question.
Transcribed Image Text:Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.7 and standard deviation 0.94. USE SALT (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 2.7 and 3.00? (Round your answers to four decimal places.) at most 3.00 between 2.7 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 You may need to use the appropriate table in the Appendix of Tables to answer this question.
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