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Hamil Coaches Ltd say that their long-distance coaches take 5 hours for a particular journey. Last week a consumer group tested these figures by timing a sample of 30 journeys. These had a mean time of 5 hours 10 minutes with a standard deviation of 20 minutes. What report can the consumer group make?
Estimating the combined mean values for the given data - find the mean for the combined sample
question the annual sales of playground equipment follow the normal distribution. however the mean and standard
Give the Z score for person who scores (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z score on this test are (d) 2.4, (e) 1.5, (f) o, and (g) -4.5
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
q1. calculate each of the following values for the data set below assume it is a population.3.42 4.10 4.15 4.19 4.26
In a certain distribution of numbers the mean is 60 with a standard deviation of 8. Use Chebyshevs theorum to tell the probability that a number lies in each interval.
events a and b are mutually exclusive. suppose event a occurs with probability 0.29 and event b occurs with probability
If we select a crew member at random, what is the probability the crew member earns:
Assume that the histogram of the data is approximately bell-shaped. Approximately how many of the 260 students had sleep times between 355 minutes and 455 minutes per night?
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. What is the value of the population mea..
As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week.
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