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A national standard requires that public bridges over 20 feet in length must be inspected and rated every 2 years. The rating scale ranges from 0? (poorest rating) to 9? (highest rating). A group of engineers used a probabilistic model to forecast the inspection ratings of all major bridges in a city. For the year? 2020, the engineers forecast that 5?% of all major bridges in that city will have ratings of 4 or below. Complete parts a and b.
a. Use the forecast to find the probability that in a random sample of 7 major bridges in the? city, at least 3 will have an inspection rating of 4 or below in 2020. ?P(xgreater than or equals≥?3)equals = ?(Round to five decimal places as? needed.)
find the range standard deviation and variance for the following sample data2 11 81 29 22 59 78 71 21 43 99 12 38 74 56
The idea behind this matrix is that if left undisturbed a grassy area will see bushes grow, then small trees, which of course grow into large trees.
In-line skaters A study of injuries to in-line skaters used data from the National Electronic Injury Surveillance System.
If you were asked to lend money to your cousin's clothing store to help her through a slow sales period, would you be more interested in looking at the current ratio or the quick ratio as a measure of liquidity? Why?
There is a very slight trend. Is the trend positive or negative? What does the direction of the trend mean in this context? Identify any unusual points.
An unknown distribution has a mean of 45 and a standard deviation of eight. A sample size of 50 is drawn randomly from the population.
The scatterplot shows information about the world's tallest 169 buildings. "Stories" means "Floors."
Suppose that network breakdowns occur randomly and independently of each other on an average rate of three per month. (a) What is the probability that there will be just one network breakdown during December? Interpret.
Given the following data for a two-way ANOVA, identify the sets of null and alternative hypotheses, then use the 0.05 level in testing each null hypothesis.
determine whether the distribution is a discrete probability distributionxnbspnbsp
An urn contains four red balls and four white balls. An experiment consists of selecting at random a sample of four balls and recording the number of red balls in the sample. Set up the probability distribution and compute its mean and variance.
a survey of 1005 randomly selected subjects claim that when respondents select days of the week the seven different
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