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The scores on this exam for all students statewide have a normal distribution with a mean of 531 and a standard deviation of 30. A local Junior High principal has decided to give an award to any student who scores in the top 15% of statewide scores. How high should a student score be to win this award?
he life expectancy of a brand of hair dryer is normally distributed wiht a mean of four years and a standard deviation of 8 months.
Best Electronics, Inc. offers a "no hassle" returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 10.4 per day and the standard deviation is 2.3 per day.
Compute the correlation and sample covariance. Compute the sample covariance and the sample correlation. Intuitively, what kind of correlation.
The model that result is: y= 0.6 + 1.2x, where the dependent variable is the amount of sales, in thousands of dollars, realized during the week and the independent variable is the amount spent on newspaper advertising, in hundreds of dollars, duri..
Nielsen publishes a weekly ranking of television programs as well as a weekly ranking of four major networks: ABC, CBS, NBC, and Fox. What kinds of decision or actions are based on the Nielsen rankings?
Determine the oucomes in the sample space, and construct a probability distribution table. Find the expected value of the following game.
If 45% of the residents play poker and garden and 50% of the residents play both shuffleboard and poker, find the probability that a resident plays poker, given that they garden (that is, find P(poker | garden)
Forecasters interest rate predictions over the period 1982 1990 were studied to see whether the predictions corresponded to what actually happened.
Draw the distribution of the random variable X, representing her time of arrival. (Be sure to include labels and values on the axes.)
Consider the case where we have n observations, sampled from a binomial pdf (our parameter estimator can therefore be given by X/n). Assume that the margin of error is 6%.
The frequency distribution below shows the distribution for suspended solid concentration (in PPM) in river water of 50 different waters collected in September 2011.
The probability that an individual is left-handed is 0.1. In a class of 30 students, what is the probability of finding at least five left-handers?
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