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4 A courier company is interested in the length of time a certain set of traffic lights is on green. The lights have been set so that the longest possible time between green lights in any one direction is 2 minutes, and the shortest possible time is 15 seconds. An employee is instructed to observe the lights and record the length of time between consecutive green lights. (a) What is the variable of interest? (b) What is the sample space? (c) Can the classical approach to probability be used to determine P (less than 60 seconds between green lights)? Why or why not? (d) What about the relative frequency approach? If so, how? If not, why not?
Would it be unusual for a return with income of $100,000 or more to be audited? What is the probability that two randomly selected returns with income of $100,000 or more will not be audited?
Suppose that 47 showed reduced allergic reactions and 17 showed an increase in allergic reactions. Are these results sufficient to conclude that the self hypothesis has a significant effect.
A candy company claims that 92% of consumers like their candies. To test this claim, 9571 people are selected at random from those who have eaten the company's candies.
2 laptops are chosen at random without replacement, what is the probability that both are high priced?
Estimate the true proportion of the incomplete files for All the bank's commericial loans. Write a statement about the confidence level and the interval you find.
A study was conducted of the annual incomes of beginning probation officers in metropolitan areas of less than 100,000 population and in metropolitan areas having more than 500,000 population.
The purchase of a coin-operated laundry is being considered by a potential entrepreneur. The present owner claims that over the past 5 years the average daily revenue has been $675 with a standard deviation of $75.
The adult books 20 are nonfiction and of the children's books 103 are nonfiction.if a book is selected at random, find the probability that it will be fiction.
If there are 5 choices for a question and there is a 50% chance that the student knows the answer, what is the probability that the student knew the answer to a question he correctly answered?
A statistics professor planed her classes so carefully that the lengths of her classes are uniformly distributed between 45 and 55 minutes. Find the probability that a given class period runs greater than 50.25 minutes.
Rachel's doctor suspects she is suffering from hypoglycaemia. The amount of glucose in the bloodstream varies and a person with hypoglycaemia has an average blood glucose level of less than 65 mg/dL.
The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. a) what is the area between 415 pounds and the mean of 400 pounds?
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