The flow in a river can be modeled as a log-normal distribution. From the data, it was estimated that, the probability that the flow exceeds 1100 cfs is 50% and the probability that it exceeds 100 cfs is 90%. Let X denote the flow in cfs in the river. What is the standard deviation of log (to the base 10) of X?
1.674 is incorrect.
The flow in a river can be modeled as a log-normal distribution. From the data, it was estimated ...
Question 15 8 pts The flow in a river can be modeled as a log-normal distribution. From the data, it was estimated that, the probability that the flow exceeds 1,013 cfs is 50% and the probability that it exceeds 100 cfs is 90%. Let X denote the flow in cfs in the river. Flood conditions occur when flow is 5000 cfs or above. To compute the percentage of time flood conditions occur for this river, we have to find, P(X25000)...
(1 point) The distribution of IQ scores can be modeled by a normal distribution with mean 100 and standard deviation 15. (a) Let x be a person's IQ score. Write the formula for the density function of IQ scores. p(x) = (b) Estimate the fraction of the population with IQ between 80 and 85. fraction =
The CO2 emissions from a factory are modeled as a lognormal distribution. If the probability that the emission is greater 1130 tonnes is 65% and the emission is greater than 100 tonnes is 95%, find the mean and standard deviation of the log-transformed CO2 emissions from the factory? [use log to the base 10]
9. (Normal distribution.) Birth weight of babies delivered at term can be mode a normal distribution with mean p = 200 ounces, and standard deviation o = 20 our Using this model, find: a. The percent of bables delivered at term that weigh between 200 ounces and 216 Ounces b. The percent of bables delivered at term that weigh more than 216 ounces. 10. (Coin Tossing. You shake up 100 pennies in a jar and empty them on a table....
Central Limit Theorem Data is drawn from a normal distribution with a mean of 50 and a standard deviation of is. A sample of 100 is taken and the sample meen computed of what is the mean of the sample mean of 100 of the b) what is sample the standard deviation mean of 100 what is the probability that the Sample mean is less than 48 CUMULATIVE I X NORM, DIST Case I
QUESTION 2 Suppose height of college students can be modeled by the normal distribution. We believe the mean of this normal distribution is 1.72m. We randomly sample 18 students and from the sample, find an average of 1.69m and a standard deviation of 0.05m. (a) What is the standard error of ? (Round your answer to four decimal places.) (b) Suppose that the standard deviation of the population is known as 0.1m. What is the z score corresponding to X-1.847...
The random variable x has a normal distribution with standard deviation 2525. It is known that the probability that x exceeds 159159 is .90. Find the mean μ of the probability distribution.
The random variable x has a normal distribution with standard deviation 24.It is known that the probability that x exceeds 170 is .90. Find the mean μ of the probability distribution.
The compressive strength of samples of cement can be modeled by a normal distribution with a mean of 6000 kilograms per square centimeter and a standar deviation of 100 kilograms per square centimeter c) what strength is exceeded by 95% of the samples? The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standar deviation of 600 hours a) what is the probability that a laser fails before 5000...
The budget for a window display can be modeled by an approximately normal distribution with a mean of $500 and a standard deviation of $80. Calculate the window display budget (in dollars) representing the bottom 15% of all window display budgets. (Use a table or technology. Round your answer to two decimal places.)