Probability that a car chosen at random
In a certain parking lot, 45% of the cars have four doors, 16% of the cars are blue, and 4% of the cars have four doors and are blue. What is the probability that a car chosen at random will have either four doors or a blue color, but not both?
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A data set consists of 83 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many scores within this data set should lie between the m
The distribution of grades on a certain test has a mean of 85.5 with a standard deviation of 11.2. There are 400 tests. Assuming that the grades are normally distributed, predict the number of students scoring between 75 and 95. Use a table of are
Find the area under the normal curve between 0.9 standard deviations on both sides of the mean.
Find the probability that a card drawn from a standard deck of playing cards will be either a four or a diamond.
We draw a ball from a bag that contains four red balls and eleven white balls. We replace the ball and draw another ball. What is the probability that both balls are white balls?
If the standard deviation for a population, as estimated from a sample, is s = 5.6, then the standard error for a sample size of N = 16 is:
When conducting a paired-samples t test, we can assess the practical importance of our obtained results by calculating:
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