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At cruising altitude, a commercial jet engine consumes an average of 850 gallons of fuel per hour with a standard deviation of 48 gallons per hour. Assuming that the fuel consumption follows a normal distribution at cruising altitude, find the probability that the hourly fuel consumption is:
(a) Between 700 and 950 gallons,
(b) Less than 750 gallons,
(c) More than 1000 gallons.
The Average GPA is known to be 2.67 with standard deviation = 0.58. What GPA will a student need to have to be admitted to the Tech school?
given a standard normal distribution find the area under the curve which liesa to the left of a 1.43b to the right of
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
Find the value of Proportion and construct a 90% confidence interval for proportion.
WLD Incorporated, a national data-collection agency, estimates that 55% of all customers at home warehouse stores (in the United States) own their own home.
A dietitian investigated whether apples washed in hot water or in cold water turned brown at different rates when exposed to air. She took 13 random apples and cut each in half.
Is the annual average wage of unmarried people (18 - 30) the same as that of married people (31 - 43)?
Absenteeism is distributed evenly throughout the week. The 0.01 level is to be used. The sample results are:
message 1. a survey of the number of calls received by a sample of southern phone company subscribers last week
Determine if the values are uniformly distributed. The researcher is using the chi-square goodness-of-fit test for this analysis.
Suppose that the number of cars, X, that pass through a car wash between 4:00pm and 5:00pm on any sunny Friday has the following probability distribution:
Use a graphical technique to compare the ages, household incomes, and education of the five groups of car buyers. (Do not use Box plots or Stem-and-Leaf Display).
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