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Brake pads in a car need to be changed on after 7 years on average. The cost is normally distributed as N($350,$50).
a. What is the probability that the pads need to be changed in the first year?
b. What is the probability that a customer will have to replace the pads only once during a period of 10 years?
c. What is the probability that a customer does not pay in excess of $500 for a brake pad replacement over a period of 10 years?
Finding the probability of each event in a group of events of different possibility
a slab milling operation is performed on the top surface of a steel rectangular workpiece 12.0 in long by 2.5 in wide.
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
The number of hours a light bulb burns before failing varies from bulb to bulb. The distribution of burnout times is strongly skewed to the right. The central limit theorem says that
a random sample of 100 doctors was selected. Suppose you reject the null hypothesis. What conclusion can you draw?
A standard deviation of $20, obtain the probability that a monthly landline phone bill for a household is less than $100.
Point is uniformly distributed in the unit sphere in three dimensions. a) Determine the marginal densities of the x, y, and z coordinates.
The batteries in his calculator. What is the probability that all four batteries work? What are the mean and variance for the number of batteries that work?
find the values of t that bound the middle 0.8 of the distribution for df 25. give your answers correct to two decimal
A researcher is estmating influence of treatment using sample selected from normally distributed population with mean of µ = 80 and standard deviation of σ = 20. Calculate power of test if researcher uses sample of n = 25 individuals.
a recent poll of 700 people who work indoors found that 278 smoke. if the researchers want to be 98 confident of their
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.
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