Find probability that service requires either more time
Suppose that the times people spend being served at a post office window are approximately normal with mean 1.5 minutes and variance .16 minutes. What are the probability that a service requires either more that 1.9 minutes or less than 1.1 minutes?
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What is the probability that there will be a least one girl? If the couple eventually has 10 children and they are all boys, what can the couple conclude?
The productivity of a factory has been recorded over 10 months, together with forecasts made the previous month by the production manager, the foreman and the Management Services Department. Compare the accuracy of the three sets of forecasts.
Assume a population variance of 0.52 kg2 of food per day. Use a 5% level of significance to determine whether the survey figure for urban people is also true for rural people on the basis of the sample data.
Suppose a sample of 19 scores has a mean of 67.43. Two additional scores are added to the sample, with values of 64.4 and 28.8. What is the mean of the sample after the two new scores are added? Provide your response precise to two decimal places.
What are the probability that a service requires either more that 1.9 minutes or less than 1.1 minutes?
Equipment was acquired for common stock. The fair value of the stock at the time of the exchange was $25,000.
If one person from the office is chosen at random, what is the probability that the person is: (a) a male administrator, (b) a female manager, (c) male, (d) an operator, (e) either a manager or an administrator, (f) either a female administrator o
A quality control test has five equally likely outcomes - A, B, C, D and E. What is the probability of C occurring?
When supermarket customers are offered free samples, they take them 60% of the time. When 317 customers are observed, what is the probability that more than 180 will take a sample?
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