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(1) A grocer stocks enough of a perishable commodity each morning to cover the expected daily demand. Having recorded the daily demand over a long period of time, the grocer found the following probability distribution for x, the daily demand:
X P(X) 1 .12 .23 .44 .25 .1
a. Calculate the mean or expected value of x.
b. Calculate the variance of x.
c. Calculate the standard deviation.
(2) Over a long period of time, it has been observed that a given rifleman can hit a target on a single trial with probability equal to .8. If he fires four shots at the target,
a. Wwhat is the probability that he will hit the target exactly 2 times?
b. What is the probability that he will hit the target more than 3 times?
If he takes a random sample of 736 customers who received loans 3 years ago, what is the average number of customers who have defaulted?
1. For each of the following scenarios, state the null and alternative hypotheses.
In terms of h, calculate the corresponding probability density function and its expectation for Fahrenheit temperature.
What is the value range for the sum of 400 draws (the possible lowest value and the largest value of the sum of 400 draws)? What is the expected value and standard error of the sum of 400 draws?
Inverse Normal, Standard In a standard Normal distribution, if the area to the left of a z-score is about 0.2000, what is the approximate z-score?
the boston public school district has had difficulty maintaining on-time bus service for its students a year later
National health care Suppose that the following table summarizes the opinions of various groups on the issue of national health care.
The sample mean talk time was 315 minutes with a standard deviation of 24 minutes. Why can we say that the sampling distribution of x is approximately normal?
A diet center claims that it has the most effective weight loss program in the region. Its advertisements say "Participants in our program lose more than 5.
information about a regression analysis includes an intercept of 5.99 and a slope of 0. make a prediction of y based on
What benefit does this two-step clustering approach have over the approaches in parts (1) and (2)? What weakness does it have?
the 2002 new york city housing and vacancy survey showed a total of 59324 rent controlled housing units and 236263
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