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The probability of a river flow exceeding 2,000 cubic meters per second is 15% and the coefficient of variation of these flows is 20%. Assuming a normal distribution calculate
(a) the mean of the flow,
(b) the standard deviation of the flow,
(c) the probability that the flow will be between 1300 and 1900 meters3/sec.
Suppose a firm that produces light bulbs wants to know whether it can say that its light bulbs typically last more than 1500 hours. Hoping to find support for their claim, the firm collects a random sample of n = 25 light bulbs and records the ..
A company has 18,000 employees. The file containing the names is ordered by employee number from 1 to 18,000. If a sample of 100 employees is to be selected from the 18,000 using systematic random sampling, within what range of employee numbers wi..
an examination is conducted entirely by multiple choice questions. there are 100 questions and 3 answers are shown for
The mean annual salary paid to all employees in a company was EURO 30.000. The mean annual salaries paid to male and female employees of the company were EURO 32.000, and 24.000, respectively. Determine the percentage of males and females employed..
Erthromyacine is a drug that has been related with side effects during pregnancy. Assume that 30% of women experience side effects between the 24th and 28th week of pregnancy.
the acceptable level for insect filth in a certain food item is 3 insect fragments per 10 grams. a sample random of 60
consider the experiments first draw a poisson random variable n with parameterlambda. then perform n independent
Find a 90% confidence interval for the true variance of the hourly wage rate for all seniors who had summer jobs. What assumption is required in order to find the said interval?
What is the probability that exactly two of the four other children (none of whom is a twin) of this couple also have blue eyes?
an average computer mouse inspector can inspect 55 mice per hour with a population standard deviation of 14 mice per
assume that a simple random sample has been selected from a normally distribution population and test the given claim.
The useful life of an electrical component is exponentially distributed with a mean of 2500 hours. a. What is the probability the circuit will last more than 3,000 hours.
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