Suppose that samples of size n = 25 are selected at random from a normal population with mean 100 and standard deviation 10.What is the probability that the sample mean falls in the interval from ag – 2,00g to ug + 0.60y ?Express your answer to four decimal places (e.g. 0.9876).The probability is0.8054Statistical Tables and Charts

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Answered: Suppose that samples of size n = 25 are…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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If X is a normally distributed random variable with a mean of 235 Findthe standard deviation given ?(? > 250) = 0.37 .
The number of ants per acre in the forest is normally distributed with mean 42,000 and standard deviation 12,469. Let X = number of ants in a randomly selected acre of the forest. Round all answers to 4 decimal places where possible. PLEASE ROUND TO 4 DECIMAL PLACES THANK YOU! B. Find the probability that a randomly selected acre in the forest has fewer than 52,999 ants. c. Find the probability that a randomly selected acre has between 34,368 and 46,431 ants. d. Find the first quartile. ants (round your answer to a whole number)
A normally distributed population has a mean equal to 85 and a standard deviation equals 4.0. If a sample of size 49 is selected what is the probability that the sample mean will be less than 73 or greater than 97?
Suppose that IQ scores in one region are normally distributed with a standard deviation of 13. Suppose also that exactly 55% of the individuals from this region have IQ scores of greater than 100 (and that 45% do not). What is the mean IQ score for this region? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
The temperature distribution of city A has a population mean u = 21.4, and standard deviation o = 4.32. You randomly select 19 days and get the temperature for these days. What is the probability that your sample mean is less than 22.14? Give your answer to 4 decimal places.
Suppose X is a normal random variable with mean µ = 70 inches. If P(X > 79) = 0.025 what is the standard deviation of this random normal variable?
Suppose that IQ scores in one region are normally distributed with a standard deviation of 18. Suppose also that exactly 60% of the individuals from this region have IQ scores of greater than 100 (and that 40% do not). What is the mean IQ score for this region? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
Suppose that the creatine kinase levels among healthy males are normally distributed with a standard deviation of 23 the healthy males have a creatine kinase level above 150 units L to at least four decimal places. Round your answer to at least one decimal place. units L X units L Research shows that exactly 5% of -. What is the mean creatine kinase level in healthy males? Carry your intermediate computations
The number of ants per acre in the forest is normally distributed with mean 42,000 and standard deviation 12,221. Let X = number of ants in a randomly selected acre of the forest. Round all answers to 4 decimal places where possible. b. Find the probability that a randomly selected acre in the forest has fewer than 32,793 ants. c. Find the probability that a randomly selected acre has between 46,676 and 51,692 ants. d. Find the first quartile. ? ants (round your answer to a whole number) PLEASE ANSWER THE 3 SUBS B, C AND D
Per the Barron's report the average weeks unemployed is 21.5 (population mean) with a population standard deviation of 5 weeks and a sample of 55. In the next five questions we will be calculating the probability that the sample of 55 will provide a mean within 1 week of the population mean. What is the probability to 4 decimals for (x<20.5)? Use the rounded standard error of the mean in calculations.
Suppose that IQ scores in one region are normally distributed with a standard deviation of 13. Suppose also that exactly 51% of the individuals from this region have IQ scores of greater than 100 (and that 49% do not). What is the mean IQ score for this region? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. ?
Assume that a population of thousands of people whose responses were used to develop the anxiety test had scores that were normally distributed with meand of 30 and standard deviation of 10. What proportion of people in this population would have anxiety scored within the following range of scores? between 10-50.

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